Reason: pelvic mass behind the uterus History: pelvic pain PELVIS:UTERUS, ADNEXA: The uterus is normal in appearance. No focal mass is identified. Both ovaries are identified and appear normal with small physiologic follicles. There is no significant free fluid.BLADDER: The gallbladder is partially collapsed but appears normal.LYMPH NODES: No significant abnormality noted.BOWEL, MESENTERY: No significant abnormality noted.BONES, SOFT TISSUES: Benign perineural cysts are noted dorsal to the sacrum. There is a femoroacetabular impingement cyst at the right femoral head neck junction.OTHER: There is a large, complex presacral mass which demonstrates heterogeneous T1 and T2 signal intensity, with a T2 hypointense rim, measuring 7.0 x 7.7 x 8.4 cm. The mass appears to the tethered to the anterior coccyx, possibly representing sacral nerve roots. There is heterogeneous enhancement with a large nodular enhancing portion in the superior portion of the mass, which measures approximately 2.5 x 2.2 cm.
Complex presacral mass with heterogeneous signal intensity and enhancement, for which the differential diagnosis includes tumors of neural origin including giant schwannoma and paraganglioma.