title: Involutional mammary duct ectasia and periductal mastitis in a male.
mesh_terms: D001940:Breast / Q000473:pathology; D001941:Breast Diseases; D001943:Breast Neoplasms / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007774:Lactation; D008297:Male; D008413:Mastitis / Q000175:diagnosis / Q000209:etiology / Q000473:pathology; D008875:Middle Aged; D008895:Milk, Human / Q000378:metabolism; D011247:Pregnancy