DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Epididymal cyst removal surgery. Surgeon dissecting a large epididymal cyst (left) and a normal testis (white). The cyst is a fluid-filled sac that forms along the epididymis, a tube that stores and carries sperm away from the testis. They are harmless but can be painful.
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