Vasculitis can stem from infections, medications, autoimmune diseases, and more. Learn what triggers this blood vessel inflammation and who is most at risk.
Bleeding at the top of your butt crack is often caused by a pilonidal cyst, skin friction, or an anal fissure. Here's what to know and when to see a doctor.
Attenuation correction fixes how PET scans measure radiotracer activity in tissue, making the difference between unreliable images and clinically useful ones.