Figure 2From: Complete and safe resection of challenging retroperitoneal tumors: anticipation of multi-organ and major vascular resection and use of adjunct proceduresFinal Pathology of Retroperitoneal Tumors. Among malignant tumors (a), sarcoma was the most common diagnosis. A variety of pathology was encountered for benign tumors (b). MPNST = malignant peripheral nerve sheath tumor.Back to article page