The explanation of post operative nipple/areolar complex necrosis is a multi-factorial one. There are many factors that can cause this issue, or combination of them. 1. Surgical technique - removing too much inferior skin causing a 'too' tight vertical closure, leading to decreased arterial (oxygenated blood) to the area. Another technique issue is removal of too much of the pedicle. 2. Medical issues - Hypertension, diabetes (small arterial disease), collagen disorders, blood & bleeding disorders, pulmonary disorders. 3. Environmental issues - Smoking, vitamin use, aspirin use. 4. Post operative issues - dirty recovery area, second hand smoke reasons, poor post operative care. Infections & hematomas causing decreased blood flow to area. Prevention is a the key. A good medical history, good surgical technique and preparation. excellent follow up care can help alleviate the risks of necrosis of the N/A complex. Hope this was not too in detail. From MIAMI