cyst, thyroglossal A fluid-filled sac that is present at birth and located in the midline of the neck. A thyroglossal cyst is a congenital malformation (a birth defect). It results from incomplete closure of a segment of the thyroglossal duct, a tube-like structure that normally closes as the embryo develops. Also called a thyroglossal duct…
cyst, tarsal See cyst, Meibomian.
cyst, synovial, of the popliteal space See Baker cyst.
cyst, sebaceous A rounded, swollen area of the skin formed by an abnormal sac of retained oily excretion (sebum) from the sebaceous glands. See also gland, sebaceous.
cyst, pilonidal An abscess that occurs in the cleft between the buttocks. Pilonidal cysts form frequently in adolescence after long trips that involve sitting, and they may be painful. Treatment frequently involves surgery if not responsive to heat applications and antibiotics.
cyst, ovarian A fluid-filled sac in the ovary. The most common type of ovarian cyst is a follicular cyst. Other cysts can contain blood; they are called hemorrhagic or endometrioid cysts. Still other types of ovarian cysts are called dermoid cysts, or ovarian teratomas. These bizarre but usually benign tumors can contain many different body…
cyst, Meibomian An inflammation of the oil gland of the eyelid. Also known as chalazion or tarsal cyst.
cyst, Baker See Baker cyst.
cyst A closed sac or capsule, usually filled with fluid or semisolid material.
cyclothymia A form of bipolar disorder in which the mood swings are less severe than manic depression. See also bipolar disorder.
cyclosporine An immunosuppressing medication (brand names: Neoral, Sandimmune) that is prescribed chiefly for organ transplant recipients and people with autoimmune disorders.
cyclophosphamide A medication (brand name: Cytoxan) that is prescribed primarily to suppress the immune system and kill growing cells in people with autoimmune disorders and certain types of cancer respectively.