system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In Patey's modified mastectomy, which of the following is preserved?
assistant
The correct answer is  In Patey's modified mastectomy, pectoralis major is preserved. PATEY'S modification* En bloc removal of nipple, areola, skin, breast tissue, breast mass + level, I, II, III LN +Excision of pectoralis minor. Variants of MRM Auschincloss Procedure Removes all breast tissue, nipple-areola complex, skin and level I & II axillary LNs. PATEY'S modification Pectoralis minor is removed to allow complete dissection of level III axillary LNs Scanlon's Modification Pectoralis minor is divided instead of removing.Division of pectoralis minor allows complete removal of level III axillary LNs