DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Close-up of the left scrotum of a 17 year old male patient showing a varicocele, varicose veins around the testis. Varicocele is caused by blood collecting in a vein in which a valve has failed causing swelling, is very common, affects the left testis in most instances, and usually is harmless.
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