This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Surgery
In Patey's modified mastectomy, which of the following is preserved? 
Select and explain. 
A. Intercostobrachial nerve, B. Pectoralis major, C. Pectoralis minor, D. Axillary fascia
B: Pectoralis major
Answer: B: Pectoralis major 
Explanation: 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