1. Presented by Jonathan Epstein, M.D. and prepared by Zarir E. Karanjawala, M.D., Ph.D.

A 56-year-old male presented with a testicular mass. On section of the testicle there were numerous cyst-like structures filled with serous yellow-to-mucoid yellow fluid. The cysts ranged in size from 0.4 cm to 2.5 cm in maximum dimension. Small portions of the inner walls of certain cysts were smooth and white-tan; others contained short, yellow, somewhat papillary projections of tissue growth. The cysts did not communicate with the tunica albuginea or with the epididymis. On gross examination, the spermatic cord was unremarkable and the lesion was confined to the testis.

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