[Cysts of the 2d branchial cleft. CAT scan aspects].

The authors describe C.T. appearances of the second branchial cleft cysts. After embryological review, they report three demonstrative observations and present the usual C.T. findings: latero cervical tumors, anterior to the sterno-cleidomastoid muscle, posterior to the submandibular gland, external to the jugulo carotidian vessels, of cystical aspect. Only the capsule is enhanced by contrast medium. C.T. brings useful informations for differential diagnosis with other cystical masses of the neck.