Nephrology focuses on diagnosing and treating kidney diseases. The kidneys filter waste, balance fluids, regulate blood pressure, and manage acute and chronic conditions.
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Patients are usually referred to renal radiology because they are experiencing specific symptoms that suggest a problem with the urinary tract. The imaging department uncovers the “what” and “why” behind these symptoms. While the radiologist does not treat the symptoms directly, their work identifies the root cause, allowing the treating physician to prescribe the correct therapy. Understanding which symptoms prompt a scan and what causes the scan might reveal helps patients connect their physical experience with the medical diagnosis.
The causes of kidney problems are vast, ranging from simple dehydration leading to stones to complex genetic conditions causing cysts. Radiology acts as the ultimate detective tool. It can distinguish between a harmless cyst and a dangerous tumor, or between a backache caused by a muscle strain and one caused by a blocked kidney. This section explores the common symptoms that lead patients to the radiology suite and the underlying causes that these scans are designed to detect.
Pain is the most common reason patients are sent for kidney imaging. This pain is often located in the flank, which is the area on your back just below the ribs, on either side of the spine.
Renal colic is a specific type of severe, wavelike pain that usually indicates a blockage. It occurs when a stone moves into the ureter, the tube connecting the kidney to the bladder. The ureter squeezes to try and push the stone out, causing intense pain. Imaging, typically a CT scan, is used immediately to find the stone’s location and size. This helps doctors decide if the stone can pass on its own or if surgery is needed.
A constant, dull ache in the lower back or side can signal swelling or infection. If the kidney is swollen due to a backup of urine (hydronephrosis) or inflammation (pyelonephritis), the outer capsule of the kidney stretches, causing a steady ache. Ultrasound is often used here to verify the size of the kidney and look for signs of swelling or fluid collection around the organ.
Changes in the appearance of urine or the act of urinating are strong signals that imaging is needed. The most alarming sign for many patients is hematuria, or blood in the urine.
Gross hematuria is when you can see blood in the toilet bowl. It can look pink, red, or even brown like tea. This can be caused by many things, including kidney stones, infections, trauma, or tumors. Radiology is essential to rule out serious causes like cancer. Often, a CT scan with contrast is the preferred method to examine the entire urinary tract lining for any masses or irregularities.
Microscopic hematuria is when blood is found in a urine test but cannot be seen with the naked eye. While often less urgent, it still requires investigation to ensure there are no hidden stones or small tumors in the renal pelvis or bladder. Imaging aids in dissecting the situation to confirm that the microscopic bleeding does not indicate an early disease.
Many kidney issues are caused by the physical structure of the organ itself. These can be things a person is born with or that grow over time. Imaging is the only way to see these structures without surgery.
Cysts are fluid-filled sacs that can form on the kidneys. They are extremely common, especially as people age. Most are harmless “simple cysts.” Ultrasound is excellent at identifying these. It shows a round, black circle with thin walls, confirming it is just fluid. This reassurance prevents patients from undergoing unnecessary surgeries.
Sometimes, a growth on the kidney is not a simple fluid sac. It might be solid or have thick walls. These are “complex masses” and are more concerning for kidney cancer. CT scans and MRIs are used to look at the texture and blood flow of the mass. If the mass takes up the contrast dye, it indicates it has a blood supply and is likely a tumor that needs removal or treatment.
High blood pressure, or hypertension, is usually a systemic issue, but in some cases, it is caused specifically by a problem with the kidney’s blood supply. This is known as renovascular hypertension.
When the renal artery—the main vessel carrying blood to the kidney—becomes narrowed, the kidney thinks the body’s blood pressure is too low. It responds by releasing hormones that raise blood pressure throughout the entire body. This narrowing is called renal artery stenosis. Radiology tests like Doppler ultrasound, CT angiography, or MR angiography are used to visualize the flow of blood through the renal arteries. Identifying this cause is crucial because fixing the narrowed artery can sometimes cure the high blood pressure.
Accidents, falls, or sports injuries can damage the kidneys. Because the kidneys are tucked high in the back, they are somewhat protected, but severe impact can cause bruising or tearing.
In trauma cases, a rapid CT scan is used to check for kidney lacerations or bleeding around the kidney (hematoma). The scan shows if the blood vessels are intact and if the kidney is still functioning. This information tells the trauma surgeons if they need to operate immediately to stop bleeding or if the injury can heal on its own with rest and observation.
Kidney infections, or pyelonephritis, usually start as a bladder infection that travels upstream. While often diagnosed by symptoms and urine tests, imaging is needed if the patient is not getting better.
Imaging can reveal complications of infection, such as an abscess (a pocket of pus) in or around the kidney. It can also show gas produced by certain bacteria, a dangerous sign requiring urgent care. In chronic infections, imaging can show scarring or unevenness in the renal cortex, the outer layer of the kidney, indicating long-term damage that might affect future kidney function.
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Kidney stones form when substances like calcium, oxalate, and uric acid become highly concentrated in the urine. Dehydration is a major cause, as it makes it take less fluid to dissolve these minerals.
Most simple infections don’t need a scan. However, if you have a fever that won’t go away or severe pain, a scan checks for blockages or abscesses that antibiotics alone can’t fix.
Imaging gives a very strong clue. It can show if a mass is solid and has blood flow, which suggests cancer. However, a biopsy or surgery is usually needed for a 100% final diagnosis.
It is a relatively common cause of secondary high blood pressure, especially in older adults with hardening of the arteries (atherosclerosis) or young women with a condition called fibromuscular dysplasia.
A renal cyst is a fluid-filled pocket on the kidney. They are very common as we age and are usually benign (not cancer) and do not require treatment unless they cause pain or become infected.
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