Aneurysmal bone cysts (ABCs), which are benign lesions of the bone, primarily affect pediatric patients. They were first described by doctors Jaffe and Lichenstein in 1942 during an investigation of ...

A cyst is a small pocket of tissue often filled with fluid or pus. It can occur due to an injury, infection, or other issues. They’re usually benign but may need treatment for complications. A cyst is ...

Medically reviewed by Lauren Schlanger, MD Key Takeaways A ganglion cyst is the most common cause of a lump on your hand or wrist and often feels round or oval. A carpal boss is a hard, bone-like lump ...