Epididymal Cyst Watchlist (log in to enable) Retrieved 2021-01-18 Source Wikipedia Trials — Genes CCND1, HNF1B, VHL, SLC26A3, SLC9A3 Drugs — Interested in hearing about new therapies? Registered! Epididymal cyst An epididymal cyst is a cyst of the epididymis containing serous liquid. They are difficult to differentiate from a spermatocele except by aspiration, since a spermatocele contains milky-appearing sperm.