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Osteomyelitis is an inflammation or swelling of bone tissue. It’s most often caused by an infection. A bone infection may occur for many reasons. It can affect children or adults.

Osteosarcoma often affects the long bones around the knee. It happens most often in children, teens, and young adults.

Paget disease of the bone is a chronic bone disorder. It causes bones to become enlarged and deformed. Bone may become dense, but fragile, because of excessive breakdown and deformation of bone. The disease is the most common bone disorder after osteoporosis in people older than age 50.

Detailed information on the most common benign bone tumors, including chondroblastoma, enchondroma, giant cell tumor, and osteochondroma

Whenever the normal drainage pattern in the lymph nodes is disturbed or damaged - often during surgery to remove the lymph nodes - the arm may swell. This swelling, caused by too much fluid, is called lymphedema.

Breast cancer in men is rare—less than 1% of all breast cancer occurs in men.

Detailed information for women following a mastectomy, including breast reconstruction, lymphedema prevention, and breast prosthesis

Helicobacter pylori (H. pylori) is a type of bacteria that infects your stomach. Learn more about this infection, including cause, risk factors, symptoms, diagnosis, and treatment.

Hemorrhoids are swollen and irritated veins or blood vessels in and around your anus and lower rectum. This happens when there is extra pressure on these veins.