Fig. 15From: Solid malignant retroperitoneal masses—a pictorial reviewImaging of cystic schwannoma. Cystic schwannoma in a 46-year-old man. The mass was detected incidentally. Axial enhanced CT scan (a) showed a well defined hypodense mass (arrow) in the left retroperitoneum. On axial T2-weighted MRI image (b) the mass (arrow) was seen to be predominantly cystic with septationsBack to article page