hygroma

(medicine) A congenital disorder in which a lymph-filled cystic cavity is formed from distended lymphatics.

A sac or cyst swollen with fluid.

A cystic swelling containing a serous fluid. Also called hydroma.

An accumulation of fluid in a sac, cyst or bursa.

• carpal h. — large fluid-filled subcutaneous sac on the anterior aspect of the carpus caused by trauma.

  Carpal hygroma. By permission from Blowey RW, Weaver AD, Diseases and Disorders of Cattle, Mosby, 1997

• cystic h., h. cysticum — an endothelium-lined, fluid-containing lesion of lymphatic origin.
• elbow h. — a fluid-filled, painless, subcutaneous swelling over the point of the elbow involving the formation of a false bursa. Occurs mainly in the large breeds of dogs and in horses where it is called shoe boil.
• hock h. — a swelling of the subcutaneous bursa over the tuber calcis. The initial soft fluctuating swelling is replaced by a firm fibrous capsule to form a hygroma. Called also capped hock.
• perirenal h. — see feline perirenal cysts.