Parents of a 4-year-old boy noted this tiny nontender cystic mass (diameter, 2 mm) on the glans near the urethral meatus. Following excision, histologic examination showed that the cyst was lined by columnar epithelium. The cause of such parameatal urethral cysts is unclear. Congenital lesions however, are believed to be caused by faulty separation of the foreskin from the glans or occlusion of the parameatal duct.
Courtesy of Alexander K.C. Leung and C Pion Kao, MD.
