Fig. 8
From: Solid malignant retroperitoneal masses—a pictorial review
Imaging of sacrococcygeal teratoma. A 49-year-old woman with benign cystic teratoma. a Unenhanced axial CT scan performed for renal colic showed a heterogeneous presacral mass with areas of soft-tissue density, fat density and a speck of calcification (arrow). Subsequent MRI shows areas of fat which show signal drop (long arrows) on the T1-weighted fat saturated images (c), and areas of haemorrhage (short arrows, b) which do not show signal drop