Online Patient Resources 
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Varicocele
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A varicocele is a dilated (enlarged) group of veins in the scrotum. Just like some people have dilated or "varicose" veins in their legs, some men have dilated veins in their scrotum. The dilated veins are filled with excess blood. We are certain that varicoceles decrease fertility but we have not yet categorically determined why this is so, although there are several theories.
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