The excision of a mammary fistula involves surgically removing an abnormal passage or tract that has developed between the mammary gland and the skin. This procedure aims to eliminate the fistula, which can cause pain, infection, and discharge, restoring normal function and promoting healing.

Total duct excision, on the other hand, refers to the complete removal of the milk ducts in the breast. This surgical procedure is often performed to address conditions such as recurrent breast infections (mastitis) or the presence of abnormal cells within the ducts (atypical ductal hyperplasia), providing symptom relief and diagnostic clarity in certain cases.