This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Plastic Surgery and Skin Lesions, Subject name: Surgery
Lipoma becomes malignant commonly at which site: 
Select and explain. 
A. Subcutaneous, B. Sub-aponeurotic, C. Retroperitoneal, D. Intermuscular
C: Retroperitoneal
Answer: C: Retroperitoneal 
Explanation: RETROPERITONEAL LIPOMA These swellings sometimes reach an immense size Retroperitoneal lipoma is often malignant (liposarcoma) and may increase rapidly in size A retroperitoneal lipoma sometimes undergoes myxomatous degeneration Clinical Features Swelling or indefinite abdominal pain More common in women Diagnosis Diagnosis is usually by ultrasound and CT scanning.