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Radiation Oncology
Cancer treatment using precisely targeted radiation therapy, often alongside surgery or medical oncology.
Radicular Cyst
A radicular cyst is a fluid-filled inflammatory sac that usually develops at the tip of a tooth root after a long-standing infection…
Radiology
Diagnostic imaging, including X-ray, CT, MRI, and ultrasound, to detect and evaluate a range of conditions.
Ranula
A ranula is a fluid-filled swelling caused by saliva collecting in the floor of the mouth, usually beneath the tongue. It often…
Rat-Bite Fever
Rat-bite fever is a bacterial infection linked to infected rats and other rodents. It can follow a rat bite, scratch, contact with…
Rdw Blood Test
The RDW blood test measures red cell distribution width, which describes how much red blood cells vary in size. It is usually…
Rectal Cancer
Rectal cancer is abnormal cell growth that begins in the rectum, the final part of the large intestine before the anus. It…
Renal Angiogram
A renal angiogram, also called renal angiography or renal arteriography, is an X-ray-based test that shows blood flow through the arteries supplying…
Renal Oncocytoma
Renal oncocytoma is a growth that develops from cells in the kidney and is generally benign, meaning it is not cancer. An…
Restless Legs Syndrome
Restless Legs Syndrome (RLS) is a neurological sleep-related movement disorder that causes an uncomfortable urge to move the legs. Symptoms commonly begin…
Rheumatoid Arthritis
Rheumatoid arthritis is a chronic autoimmune disease and type of inflammatory arthritis that causes joint pain, swelling and stiffness. The immune system…
Rheumatology
Diagnosis and treatment for autoimmune and inflammatory conditions affecting the joints and connective tissue.
Right Ventricular Failure
Right ventricular failure happens when the right ventricle cannot pump blood effectively from the body to the lungs. This reduced pumping can…
Rocky Mountain Spotted Fever
Rocky Mountain spotted fever is a bacterial infection caused by Rickettsia rickettsii and spread mainly through the bite of an infected tick.…
Rotator Cuff Tear
A rotator cuff tear is a split or break in one or more of the tendons that connect the shoulder muscles to…
Rotavirus Infection
Rotavirus infection is a contagious viral illness that commonly causes vomiting and watery diarrhea. Infants and young children are affected most often,…
Runny Nose
A runny nose means mucus or watery fluid is draining from the nostrils. The lining inside the nose can increase its secretions…
Sarcoidosis
Sarcoidosis is an inflammatory condition in which clusters of immune cells, called granulomas, form in one or more organs. The lungs and…
Sarcoma Cancer
Sarcoma cancer is a group of cancers that begins in connective tissues, such as muscle, fat, blood vessels, nerves, and tendons, or…
Sars-Cov-2
SARS-CoV-2 is a coronavirus that can infect people. COVID-19 is the illness that infection with this virus can cause. Like other viruses,…
Scabies
Scabies is a contagious skin infestation caused by microscopic Sarcoptes scabiei mites. The mites burrow into the outer layer of skin, where…
Scarlet Fever
Scarlet fever is a contagious infection caused by group A Streptococcus bacteria. Another name for it is scarlatina. Children are the most…
Schizophrenia
Schizophrenia is a serious, treatable mental health condition that can affect thoughts, perceptions, emotions, behavior, and daily functioning. A person may have…
Sciatica
Sciatica is pain caused by irritation, inflammation, or compression of the sciatic nerve. This large nerve travels from the lower back through…
