PT - JOURNAL ARTICLE AU - Joshi, M.J. AU - Provenzano, M.J. AU - Smith, R.J.H. AU - Sato, Y. AU - Smoker, W.R.K. TI - The Rare Third Branchial Cleft Cyst AID - 10.3174/ajnr.A1627 DP - 2009 Oct 01 TA - American Journal of Neuroradiology PG - 1804--1806 VI - 30 IP - 9 4099 - http://www.ajnr.org/content/30/9/1804.short 4100 - http://www.ajnr.org/content/30/9/1804.full SO - Am. J. Neuroradiol.2009 Oct 01; 30 AB - SUMMARY: Third branchial cleft cysts (BCCs) are rare entities that represent abnormal persistence of the branchial apparatus. On CT examination, these cysts appear as homogeneous low-attenuation masses with well-circumscribed margins; on MR imaging, they demonstrate variable signal intensity on T1-weighted images and are hyperintense relative to muscle on T2-weighted images. Definitive treatment is surgical excision. We present a case of a third BCC and describe its diagnosis and treatment.