Branchial Cleft Cyst (Cleft Sinus)
DefinitionA branchial cleft cyst is a birth defect found in the neck or just below the collarbone (clavicle) that may be visible as a pit in the skin, a projection of tissue, or a lump.
Overview, Causes, & Risk Factors
Branchial cleft cysts appear early during development of the embryo when tissues of the branchial cleft (the area in the neck and collarbone) fail to develop normally. Open spaces called sinuses may remain on one or both sides of the neck.
A cyst may form from fluid drained from a sinus, and the cyst or sinus can become infected.
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