Mammary duct ectasia

Illustration of mammary duct ectasia 
Mammary duct ectasia occurs when a milk duct beneath the nipple becomes wider (dilated) and filled with fluid. The milk duct can then become blocked or clogged with a thick, sticky substance. Mammary duct ectasia usually causes no signs or symptoms, but some women may have nipple discharge, breast tenderness or inflammation of the clogged duct.
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