M.C. retroperitoneal tumour is -: (A) Fibrosarcoma, (B) Liposarcoma, (C) Dermoid cyst, (D) Rhabdosarcoma
Answer is B. Ans is 'b' ie Liposarcoma The most common primary malignancy of the retroperitoneum is sarcoma.(Ref Sabiston) "In the retroperitoneal location, well-differentiated and dedifferentiated liposarcoma and leiomyosarcoma are the most common histiotypes, whereas in the visceral location, GISTs are found most commonly."- Devita's Oncology