What can cause a false positive on a PET scan?
<SEP-14080_image_1>

PET scans are great for finding cancer. But, not every abnormal result means you have cancer. Some medical and technical issues can lead to false positives, making it hard for doctors.

Inflammatory or infectious processes are big reasons for false positives in PET scans. Research shows that up to 40% of FDG uptake in post-therapy patients is in non-cancerous tissue.

We want to know what leads to false positive results to make sure diagnoses are right. By looking into causes like inflammation, infections, and technical problems, we can better understand this challenge.

Key Takeaways

• Inflammatory processes can cause false positive PET scan results.
• Infectious processes can also lead to false positive results.
• Technical issues can contribute to false positive PET scan results.
• Accurate diagnosis requires understanding the causes of false positives.
• False positive results can occur in non-cancerous tissue.

Understanding PET Scan Technology

It’s important to know how PET scans work to understand their results. PET scans are advanced tools used in medicine. They help diagnose and manage health issues by showing how active cells are in the body.

How PET Scans Work

PET scans detect how active cells are in the body. They use a special tracer, like Fluorodeoxyglucose (FDG), which cells absorb based on their activity. The PET scanner then picks up this radiation, making detailed images of the body’s activity.

This method helps spot areas with high activity, like tumors. First, the FDG tracer is injected into the patient’s blood. Then, the body absorbs it, and the PET scanner captures its distribution. This gives us images of the body’s metabolic activity.

The Role of FDG in Imaging

FDG acts like glucose, which cells use for energy. Cancer cells, with their high energy needs, take up more FDG. This makes them visible on PET scans. But, other conditions like inflammation can also show up, leading to false positives.

A study on the National Center for Biotechnology Information (NCBI) shows the importance of understanding FDG uptake. It explains how different processes can affect FDG uptake, leading to misinterpretations.

Interpreting PET Scan Results

Interpreting PET scan results needs a deep understanding of the patient’s history and the scan’s technology. We must look at factors like inflammation and infections that can affect FDG uptake. Accurate results mean knowing the difference between true positives and false positives.

It takes skilled professionals to analyze PET scan images and match them with the patient’s health. This ensures PET scans are used effectively and accurately.

The Prevalence of False Positives in PET Scans

It’s important to know about false positives in PET scans for accurate diagnosis. These false positives can cause unnecessary worry, extra tests, and wrong treatments. We’ll look at how common they are and their effect on patient care.

Statistical Overview

Research shows that false positives happen in a big part of PET scans. For example, a study found that about 15% of PET scans showed false positives. This shows we need to be careful when reading PET scan results. The rate of false positives can change based on the scan type, technology, and how results are judged.

Another study found that the rate of false positives can change based on the scan’s use. This is important for doctors to know when they’re reading results. The rate of false positives also changes among different patients, with some groups more likely to get them because of their health.

Impact on Patient Diagnosis

False positives can really affect how patients are diagnosed. A false positive can mean more tests, like biopsies, which are costly and stressful. This not only raises healthcare costs but also worries patients a lot. Also, a false positive can make finding the real problem take longer, which can hurt treatment results.

We must stress the need for accurate PET scan readings. Knowing about false positives and their effects helps doctors improve. They can use better imaging, check results with other tests, and work together to care for patients.

In short, while PET scans are helpful, the issue of false positives is big. By facing this problem, we can make PET scans more accurate. This will help patients get better care.

Inflammatory Processes as a Major Cause of Pet Scan False Positive Results

Inflammation can cause false positives in PET scans. It affects the accuracy of PET scan results. Understanding this is key when talking about false positives in PET scans.

Inflammation is how our body reacts to injury or infection. It can show up in different ways. In PET scans, it can make it seem like there’s cancer when there isn’t.

Acute Inflammation

Acute inflammation is a quick response to injury or infection. It brings more blood flow and white blood cells. This can make PET scans show false positives because of the high activity.

For example, abscesses, pneumonia, or inflammation after surgery can cause this. It makes it hard to tell if it’s inflammation or cancer.

Chronic Inflammatory Conditions

Chronic inflammation lasts a long time. It’s seen in conditions like rheumatoid arthritis or inflammatory bowel disease. These can make PET scans show cancer when it’s not there.

It’s important to look at the patient’s history and current health when reading PET scans. This helps tell the difference between inflammation and cancer.

Why Inflammation Mimics Cancer in PET Imaging

Inflammation and cancer both show up as high activity in PET scans. The FDG tracer goes to areas with high glucose use. This isn’t just cancer cells.

Cells like macrophages and lymphocytes also use a lot of glucose. This means they can also show up as positive on PET scans. So, it’s important to look at the bigger picture and use other tests to confirm findings.

Infectious Diseases Leading to False Readings

False positive PET scans can happen due to many infectious conditions. These diseases cause the body’s immune system to react, which can look like cancer on a PET scan.

Bacterial Infections

Bacterial infections often lead to false positives on PET scans. Pneumonia, abscesses, and osteomyelitis can make the body use more glucose, like cancer does. A study showed that many false positives in cancer scans were due to bacterial infections.

• Pneumonia: Inflammation in the lungs can cause increased FDG uptake.
• Abscesses: Collections of pus can mimic tumors due to high metabolic activity.
• Osteomyelitis: Bone infections can lead to false positives in PET scans, specially in patients with a history of cancer.

Viral Infections

Viral infections can also cause false positives on PET scans. Some viruses cause inflammation and higher metabolic activity, which can look like cancer.

1. Viral pneumonia can cause diffuse lung uptake.
2. Infections like HIV can lead to reactive lymphadenopathy, which may be misinterpreted as lymphoma.

Fungal Infections

Fungal infections can also cause false positives in PET scans. These diseases, mainly in people with weakened immune systems, cause a lot of inflammation and increased FDG uptake.

Aspergillosis and Candidiasis are examples of fungal infections that can lead to false positive results. These conditions often need careful review of the patient’s history and other tests to correctly understand PET scan results.

It’s important to know how infectious diseases can cause false positives on PET scans. By looking at the patient’s overall health and using other tests when needed, doctors can avoid mistakes.

Granulomatous Diseases and Their Impact on PET Results
<SEP-14080_image_2>

Granulomatous diseases can make it hard to read PET scan results because they can cause false positives. These diseases form granulomas, which are groups of immune cells. These granulomas can show up as cancer on PET scans because they take up glucose.

Tuberculosis and Tuberculomas

Tuberculosis (TB) is a disease that can lead to false positives on PET scans. TB is caused by Mycobacterium tuberculosis and mainly hits the lungs. But it can spread to other parts of the body. Tuberculomas, which are clusters of inflammation, can look like cancer on PET scans.

It’s hard to tell TB from cancer because they both can look similar on scans. Doctors need to use more tests to figure out what’s really going on.

Sarcoidosis

Sarcoidosis is another disease that can cause false positives on PET scans. It’s a condition where non-caseating granulomas form in different organs, like the lungs and lymph nodes. This can make it look like cancer on PET scans.

When looking at PET scans, it’s important to think about sarcoidosis, even if the patient has had it before. The right signs and symptoms can help doctors make the right call.

Other Granulomatous Conditions

Other diseases like granulomatosis with polyangiitis (GPA) and chronic granulomatous disease can also mess with PET scan results. These conditions cause inflammation and granulomas in different organs. This can lead to false positives on PET scans.

• Granulomatosis with polyangiitis (GPA) is a vasculitis that can affect multiple organs, including the lungs, kidneys, and upper respiratory tract.
• Chronic granulomatous disease is a genetic disorder characterized by recurrent infections and granuloma formation.

Knowing about granulomatous diseases and how they can cause false positives on PET scans is key. By using all the information they have, doctors can make better decisions. This helps avoid unnecessary treatments.

Post-Treatment and Post-Surgical Changes

Changes after treatment or surgery can affect PET scan results. These changes can make it hard to understand what the scans show.

Radiation-Induced Inflammation

Radiation therapy is used to fight cancer. But it can also cause inflammation. This can make PET scans show false positives, thinking there’s cancer when there isn’t.

Key factors influencing radiation-induced inflammation:

• Radiation dose and fractionation
• Volume of tissue irradiated
• Time elapsed after radiation therapy

Post-Surgical Healing Processes

Surgery starts a healing process with inflammation and repair. This can make PET scans show more activity than usual. Knowing how long it takes for healing is key to understanding PET scans.

Post-Surgical Changes	Typical Timing	PET Scan Findings
Acute inflammation	0-6 weeks	Increased FDG uptake
Tissue repair	6-12 weeks	Gradual decrease in FDG uptake
Scar tissue formation	After 12 weeks	Variable FDG uptake, often low

Distinguishing Recurrence from Treatment Effects

Telling cancer recurrence from treatment effects is tough. It’s important to look at the patient’s history, symptoms, and other tests to make a correct diagnosis.

Understanding changes after treatment and surgery helps doctors better read PET scans. This reduces false positives and ensures patients get the right care.

Technical Factors Contributing to Misinterpretation
<SEP-14080_image_3>

Misreading PET scan results often comes from technical problems, not clinical ones. PET scans are very useful for diagnosis but can be off due to technical issues. Knowing these issues helps us interpret images correctly.

Misregistration Artifacts

Misregistration artifacts happen when PET and CT images don’t match up. This can be due to patient movement or breathing differences. It makes areas look active when they’re not, causing false positives.

To fix this, we use advanced algorithms to align PET and CT images better. But, radiologists must watch for any signs of misalignment in the images.

Attenuation Correction Errors

Attenuation correction is key in PET imaging. It adjusts for signal loss due to body tissues. But, mistakes in this step can lead to wrong images. For example, if CT and PET data don’t match, or if CT images have artifacts, it can cause errors.

We need to make sure our PET/CT scanners are calibrated right. Our technologists should be trained to avoid artifacts. Regular checks are also key to spotting and fixing any issues with attenuation correction.

Quality Control Issues

Quality control is essential in PET imaging. Problems like detector malfunctions or scanner calibration issues can affect image quality. For instance, a faulty detector can create artifacts that look like increased activity.

• Regular maintenance and quality control checks are necessary to ensure that the PET/CT scanner is functioning correctly.
• Technologists should be trained to recognize and troubleshoot common issues that may arise during scanning.
• It’s also important to have protocols for handling and preparing the radiopharmaceutical to avoid contamination or other problems.

By tackling these technical issues, we can make PET scan interpretations more accurate. This helps us give better care to our patients.

Physiological Causes of Increased FDG Uptake
<SEP-14080_image_4>

It’s important to know why PET scans might show false positives. This helps doctors give accurate diagnoses. Physiological processes can sometimes cause this.

Several things can make FDG uptake go up. These include brown fat, muscle activity, and normal organ function. Let’s look at each to understand their effects on PET scans.

Brown Fat Activation

Brown fat is a special type of fat that burns calories. It helps keep us warm when it’s cold. But when it’s active, it can make PET scans show false positives.

“Activated brown fat can make PET scans hard to read,” says a nuclear medicine expert. Keeping the patient warm during the scan can help reduce brown fat activity.

Muscle Activity

Muscle activity also increases FDG uptake. This happens when muscles are working hard, like during exercise. It’s a problem if the muscles are near tumors or other lesions.

To avoid muscle activity affecting PET scans, patients should rest before the scan. Proper preparation is key to reducing muscle-related artifacts.

Normal Organ Metabolism

Some organs, like the brain, liver, and heart, use a lot of glucose. This means they will show high FDG uptake on scans. Knowing how these organs work is key to telling normal from abnormal activity.

“The key to accurate PET scan interpretation lies in recognizing the normal patterns of FDG uptake in various organs and tissues, and differentiating these from abnormal or malignant activity.”

Understanding these causes helps doctors get better results from PET scans. This leads to better care for patients.

Medication and Diet-Related False Positives

Medications and diet can affect how accurate PET scans are. They might lead to false positives. Knowing about these factors helps in getting the right diagnosis and treatment.

Impact of Medications on FDG Uptake

Some medicines can change how FDG is taken up by cells. This can make PET scans show things that aren’t cancer. It’s important to think about the medicines patients are on when looking at PET scan results.

• Colony-stimulating factors can increase FDG uptake in bone marrow.
• Insulin can affect glucose metabolism, potentially altering FDG distribution.

Dietary Factors Affecting Scan Results

What we eat can also change how accurate PET scans are. Eating a lot of sugar or carbs before a scan can mess with FDG uptake. This is because these foods compete with FDG for cells to take in.

Dietary Factor	Effect on PET Scan
High sugar intake	Reduced FDG uptake in tumors due to competition
Caffeine	Potential reduction in brown fat activity

Pre-Scan Preparation Guidelines

To avoid false positives, patients need to follow certain steps before their scan. They should fast for a while, avoid hard exercise, and tell about all their medicines and supplements.

Benign Tumors and Lesions That Mimic Malignancy
<SEP-14080_image_5>

PET scans are very useful but can sometimes mistake benign conditions for cancer. This mistake can cause a lot of worry and extra tests for patients. We will look at some common benign tumors and lesions that might look like cancer on PET scans.

Thyroid Nodules

Thyroid nodules are quite common and usually not cancerous. But, they can sometimes show up as cancer on PET scans because of inflammation or other non-cancerous reasons. A study showed that some thyroid nodules can take up more FDG, making them look like cancer.

Bone Lesions

Benign bone lesions, like fibrous dysplasia or bone cysts, can also be mistaken for cancer on PET scans. These lesions might show up as cancer because of inflammation or bone changes.

Soft Tissue Abnormalities

Soft tissue issues, like inflammation or infections, can also cause false positives on PET scans. Conditions like abscesses or granulomatous diseases can look like cancer because of their metabolic activity.

To tell these benign conditions apart from cancer, doctors use more imaging, look at the patient’s history, and sometimes take a biopsy. Knowing about these benign conditions is key to correctly reading PET scans.

Benign Condition	Characteristics	Distinguishing Features
Thyroid Nodules	Common, often benign	Ultrasound characteristics, fine-needle aspiration
Bone Lesions	Fibrous dysplasia, bone cysts	Radiographic appearance, clinical history
Soft Tissue Abnormalities	Inflammatory, infectious processes	Clinical presentation, additional imaging

Post-Chemotherapy Complications and False Positives

After chemotherapy, complications can make PET scans less accurate, leading to false positives. Chemotherapy is key in fighting cancer, but its effects don’t stop after treatment ends. Knowing these effects is key for correct PET scan readings.

Therapy-Induced Inflammation

Chemotherapy can cause inflammation in the body. This inflammation can make PET scans show false positives. The body’s reaction to treatment can make it hard to tell if cancer is coming back or if it’s just treatment effects.

For example, chemotherapy can cause colitis, leading to high FDG uptake in the colon. This can look like cancer. Therapy-induced pneumonitis can also cause high uptake in the lungs.

Opportunistic Infections Following Immunosuppression

Chemotherapy weakens the immune system, making patients more likely to get infections. These infections can cause false positives on PET scans because of the inflammation they cause.

Patients on chemotherapy are at risk for infections like pneumonia or colitis. These infections can show up as high FDG uptake. It’s important to tell these infections apart from cancer for the right treatment.

Infection Type	Common PET Scan Findings	Distinguishing Features
Pneumonia	Increased FDG uptake in lung parenchyma	Clinical symptoms, distribution, and correlation with CT findings
Colitis	FDG uptake in the colon	Clinical presentation, endoscopic findings

Timing Considerations for Post-Treatment Scans

The timing of PET scans after chemotherapy is very important. Scans done too soon might not show true disease presence because of inflammation from treatment.

It’s best to wait a bit after chemotherapy before doing a PET scan. This wait lets therapy-induced changes go away, making the scan more accurate.

We suggest a team approach for interpreting PET scans after chemotherapy. This includes looking at clinical details, lab results, and imaging to get a clear picture.

Age-Related Factors in PET Scan Interpretation

PET scan results can be influenced by age. It’s important to consider a patient’s age when looking at scan data. The accuracy of PET scans varies in kids and older adults because of their different body functions.

Pediatric Considerations

Interpreting PET scans in kids is hard because their bodies are always changing. Kids’ brains and other tissues use more glucose than adults’, which can make scan results tricky to understand.

For example, it’s hard to tell if brown fat activity is normal or not in kids. It’s important to know these age-related differences to avoid mistakes and make sure diagnoses are correct.

Age Group	Common PET Scan Challenges	Interpretation Considerations
Pediatric	High metabolic rate, brown fat activity	Distinguishing normal from pathological uptake
Geriatric	Comorbidities, medication effects	Accounting for multiple health conditions

Geriatric Patients and Comorbidities

Older adults often have many health issues like diabetes and heart disease. These can make it harder to understand PET scan results. Increased FDG uptake can happen due to inflammation or infection, which might look like cancer if not seen in the right context.

For example, an older adult with diabetes might show more FDG uptake in areas of neuropathy or infection. This could be mistaken for cancer if not looked at with their whole health situation in mind.

It’s key to understand these age-related factors for accurate PET scan readings. By taking into account the unique body functions of different age groups, doctors can better diagnose and help patients.

Advanced Imaging Protocols to Reduce False Positives
<SEP-14080_image_6>

Advanced imaging in PET scans is key to cutting down on false positives. It helps improve patient care. New techniques are being used to tackle the issue of false positives.

Dual-Time Point Imaging

Dual-time point imaging takes PET scans at two times after the tracer is given. It helps tell if a lesion is cancerous or not. Cancerous areas usually take up more of the tracer over time.

Benefits of Dual-Time Point Imaging:

• It makes it easier to tell cancer from non-cancerous lesions.
• It boosts doctor confidence in their diagnoses.
• It might cut down on the need for biopsies and follow-ups.

PET/MRI Fusion Technology

PET/MRI fusion combines PET’s metabolic info with MRI’s detailed images. This hybrid method gives a clearer picture of what’s happening inside the body. It helps doctors understand the body’s metabolic activity better.

Advantages	Clinical Impact
It helps pinpoint where PET scan findings are in the body.	It makes diagnoses more accurate and confident.
It helps better understand what lesions are.	It leads to more precise treatment plans.
It cuts down on false positives by being more specific.	It reduces unnecessary worry and procedures for patients.

Novel Radiotracers Beyond FDG

While FDG is common in PET scans, new tracers are being made. These target specific body processes like tumor growth and oxygen levels. They offer more info than FDG, which can lower false positives.

Examples of novel radiotracers include:

• Fluorothymidine (FLT) for checking tumor growth.
• Fluoromisonidazole (FMISO) for looking at tumor oxygen levels.
• Receptor-targeted tracers for certain cancers.

By using these advanced imaging methods, we can lower false positives in PET scans. This leads to more accurate diagnoses and better care for patients.

The Importance of Clinical Correlation in PET Interpretation

To avoid false positives, PET scan interpretation must be integrated with clinical context. We stress that clinical correlation is key for accurate diagnosis. It combines imaging data with patient history, lab findings, and other relevant factors.

Integrating Patient History

A patient’s medical history is vital for interpreting PET scans. We look at previous diagnoses, treatments, and ongoing conditions. This helps us understand the likelihood of false positives.

For example, inflammatory processes or infections can cause increased FDG uptake, mimicking malignancy. By using patient history, we can better tell true positives from false positives.

Laboratory Findings

Laboratory results, like blood tests and biopsy reports, offer valuable information. We review these to identify causes of false positives, such as infection or inflammation. They also help confirm the presence of malignancy.

For example, high white blood cell counts may show an infectious process. This could explain increased FDG uptake on a PET scan. By linking lab findings with PET scan results, we improve diagnostic accuracy.

Multidisciplinary Approach to Image Analysis

A team effort involving radiologists, oncologists, surgeons, and other healthcare professionals is essential. We work together to share knowledge and expertise. This ensures PET scan results are seen in the patient’s overall clinical picture.

This teamwork helps us spot pitfalls in diagnosis and understand the patient’s condition better. By combining imaging expertise with clinical knowledge, we lower false positives and improve patient outcomes.

When to Consider Additional Testing After a Positive PET Scan

A PET scan might show a problem, but it’s not always a sign of disease. Sometimes, it can be a false positive due to inflammation or infection. So, it’s key to do more tests to confirm the findings.

Biopsy Indications

A biopsy is the best way to know if cancer is present. We think about doing a biopsy if the PET scan is not clear or if other tests don’t give a diagnosis. For example, if a PET scan finds high FDG uptake in a lymph node, a biopsy can tell if it’s cancer or not.

Deciding to do a biopsy depends on many things. These include the patient’s health, where the suspicious area is, and the risks of the biopsy. We carefully consider these to make sure the benefits of a biopsy are greater than the risks.

Biopsy Type	Indications	Benefits
Fine-needle aspiration biopsy	Suspicious lymph nodes or masses	Minimally invasive, quick results
Core needle biopsy	Larger masses or when more tissue is needed	Provides more tissue for histological examination
Surgical biopsy	When other methods are inconclusive or more tissue is required	Most definitive diagnosis, allows for histological examination

Follow-up Imaging Recommendations

It’s important to keep an eye on how a disease changes over time. We suggest doing follow-up PET scans or other imaging like CT or MRI. How often to do this depends on the type of cancer, treatment plan, and how the patient is doing.

“The use of follow-up imaging should be tailored to the individual patient’s needs, taking into account the clinical context and the possible benefits and risks of more radiation.”

— Expert in Nuclear Medicine

For example, in cancer patients, follow-up PET scans can spot recurrence early. In other cases, imaging might check how well treatment is working.

Monitoring Strategies

After a positive PET scan, we use a mix of clinical checks, lab tests, and imaging. We make a plan that fits the patient’s specific situation, treatment goals, and risks.

Good monitoring means regular check-ups, imaging when needed, and changing the treatment plan if necessary. This way, we can catch disease recurrence or growth early and act quickly.

In summary, deciding on more testing after a positive PET scan is a careful process. It involves thinking about the need for biopsy, follow-up imaging, and monitoring plans. By taking a thoughtful and team-based approach, we make sure patients get the right care for their needs.

Conclusion: Improving Accuracy in PET Scan Interpretation

Getting PET scans right is key for good patient care. We’ve talked about why scans might show false positives. This includes inflammation, infections, and technical issues. Knowing these reasons helps us get better at reading PET scans.

To cut down on false positives, we need a detailed approach. This includes looking at the patient’s history and lab results. Also, using advanced imaging techniques helps a lot. For example, dual-time point imaging and PET/MRI fusion technology are very helpful.

As we learn more about PET scans, we can make diagnoses more accurate. Recognizing that PET scans can sometimes be wrong is important. By understanding why this happens, we can work to fix these mistakes. This way, patients get the right diagnosis and treatment they need.

FAQ

What is a false positive PET scan result?

A false positive PET scan result happens when a scan shows disease, like cancer, but there’s no disease. This is a mistake.

Can PET scans be wrong?

Yes, PET scans can be wrong. This can happen for many reasons, like inflammation, infections, or technical problems.

What are some common causes of false positive PET scan results?

False positives can come from many sources. These include inflammation, infections, and even technical mistakes.

How can inflammatory processes lead to false positive PET scan results?

Inflammation can make PET scans show cancer when there isn’t any. This is because inflammation can make the scan pick up on it.

Can infections cause false positive PET scan results?

Yes, infections can make PET scans show disease when there isn’t any. This is because infections can make the scan pick up on them.

What is the impact of granulomatous diseases on PET scan results?

Diseases like tuberculosis and sarcoidosis can make PET scans show disease when there isn’t any. This is because they can make the scan pick up on them.

How can post-treatment and post-surgical changes affect PET scan results?

Changes after treatment or surgery can make PET scans show disease when there isn’t any. This is because these changes can make the scan pick up on them.

What are some technical factors that can contribute to misinterpretation of PET scan results?

Technical issues can also lead to mistakes in PET scans. These include problems with how the scan is done and how the images are made.

Can physiological processes lead to false positive PET scan results?

Yes, normal body processes can make PET scans show disease when there isn’t any. This includes things like muscle activity and normal organ function.

How can medications and diet affect PET scan results?

Some medicines and foods can affect how PET scans work. This can make them show disease when there isn’t any. Following certain guidelines before the scan can help.

Can benign tumors and lesions mimic malignancy on PET scans?

Yes, some non-cancerous growths can look like cancer on PET scans. This can lead to false positives.

What is the role of clinical correlation in PET scan interpretation?

It’s important to look at the whole picture when interpreting PET scans. This includes the patient’s history and other tests. A team approach is best.

When should additional testing be considered after a positive PET scan?

More tests are needed after a positive PET scan. This includes biopsies and follow-up scans. It helps confirm or rule out disease.

What is the combining form that means glowing?

The term “fluoro” means glowing. It’s used in terms like “fluoroscopy” and in PET scans with Fluorodeoxyglucose (FDG).

Is it true that hot glass looks the same as cold glass?

No, hot glass doesn’t look the same as cold glass. While it may not change color much, it can glow when very hot. This is related to incandescence.

References

1. Chang, J. M., Goo, J. M., Kim, H. J., & Park, C. M. (2006). False positive and false negative FDG-PET scans in various thoracic diseases. Korean Journal of Radiology, 7(1), 57-69. https://doi.org/10.3348/kjr.2006.7.1.57 (PMCID: PMC2667579) PMC
   
2. Long, N. M., et al. (2011). Causes and imaging features of false positives and false negatives in ^18F-FDG PET-CT. [Journal Name]. https://pmc.ncbi.nlm.nih.gov/articles/PMC3259390/ PMC
   
3. Bergamaschi, R., et al. (n.d.). Research cautions on false positives for cancer with PET scans. Stony Brook Cancer Center. Retrieved from https://cancer.stonybrookmedicine.edu/falsepositives Stony Brook Cancer Center
   
4. Shreve, P. D., Anzai, Y., Wahl, R. L. (1999). Pitfalls in oncologic diagnosis with FDG PET imaging. Radiographics, 19(1), 61-77. https://doi.org/10.1148/radiographics.19.1.g99ja0761 RSNA Publications
   
5. Smith, C. S., et al. (2008). False-Positive Findings on ^18F-FDG PET/CT. AJR. American Journal of Roentgenology, 190(2), 570-576. https://doi.org/10.2214/AJR.07.3061 AJR Online
   
6. Adejolu, M., et al. (2012). False-Positive Lesions Mimicking Breast Cancer on FDG PET. AJR. American Journal of Roentgenology, 198(2), W101-W111. https://doi.org/10.2214/AJR.11.7130 AJR Online
   
7. Wan, D. Q., et al. (2010). False positive for malignancy of a lung nodule on FDG PET/CT scans. [Journal Name]. https://www.sciencedirect.com/science/article/abs/pii/S0899707109003040 ScienceDirect
   
8. (2023). False Positive Positron Emission Tomography/Computed Tomography (PET/CT) requiring biopsy for proper staging of lung cancer. Cureus. Retrieved from https://www.cureus.com/articles/86864-false-positive-positron-emission-tomographycomputed-tomography-petct-requiring-biopsy-for-proper-staging-of-lung-cancer