<prompt> Green discharge is M. Commonly seen withDuct papillomaDuct ectasiaRetention cystFibroadenosis  <response>: Ans is b ie Duct ectasia A black or green discharge is usually due to duct ectasia and its complications. - Bailey Love.Duct ectasia is dilatation of lactiferous ducts associated with periductal inflammation, the pathogenesis of which is unknown. 