A lady presents with itching around the breast and greenish foul smelling discharge from the nipple. She had a similar episode before. What is the most likely diagnosis?

The key is B. Duct ectasia. [Duct ectasia of the breast or mammary duct ectasia or plasma cell mastitis is a condition in which the lactiferous duct becomes blocked or clogged. This is the most common cause of greenish discharge. Mammary duct ectasia can mimic breast cancer. It is a disorder of peri- or post-menopausal age].