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Lymphedema is a chronic, progressive disease that causes swelling because of non-functioning lymphatic vessels.

Macrodactyly is an uncommon condition in which a baby's toes or fingers are abnormally large due to the overgrowth of the underlying bone and soft tissue.

Mitochondrial disease is not a single disorder but an umbrella term for dozens of individual disorders in which the body’s cells have problems producing energy.

A non-ossifying fibroma is a benign (non-cancerous), non-aggressive tumor that consists mainly of fibrous tissue. It usually occurs in the thighbone or shinbone.

Ovarian cysts are fluid-filled sacs that usually dissolve after ovulation and can cause pain, but most often go away on their own.

An osteoid osteoma is a benign, small tumor that usually grows in the long bones of a person’s lower extremities.

Syndrome of inappropriate antidiuretic hormone secretion (SIADH) occurs when excessive levels of antidiuretic hormones are produced.