case_images: PMC5379804_01
case_images: Axial (a) and parasagittal (b) magnetic resonance imaging of lumbosacral spine showing a left paracentral protrusion at L5-S1 space. Severe disc dehydration suggests presence of a degenerative disc disease
case_images: AJNS-12-51-g001.jpg
case_images: PMC5379804_01_AJNS-12-51-g001.jpg
case_images: F1
case_images: On MRI, disc protrusion was observed in L5-S1 region with signs of disc dehydration and degenerative disc disease [Figure 1].
case_images: A pelvic computerized tomographic scan at three different levels showing an isodense tumor of the left pelvic cavity anterior to sacrum with cystic components
case_images: AJNS-12-51-g002.jpg
case_images: PMC5379804_01_AJNS-12-51-g002.jpg
case_images: F2
case_images: There was no bone invasion and destruction [Figure 2].
case_images: T1-(a) and T2 (b)-weighted axial magnetic resonance imaging showing an iso-intense tumoral mass in the right pre-sacral area. Cystic components are evident in T2-weighted images. An early post-operative image (c), almost at the same level, is also presented
case_images: AJNS-12-51-g003.jpg
case_images: PMC5379804_01_AJNS-12-51-g003.jpg
case_images: F3
case_images: Comparing the surrounding muscles, the lesion was iso-intense on T1-weighted and hyper-intense on T2-weighted images [Figure 3].
case_images: (a) Intra-operatively, a well-defined mass in retro-peritoneal area with a well-formed capsule is shown; (b) After opening the capsule, a yellow gelatinous material was evacuated from a cyst
case_images: AJNS-12-51-g004.jpg
case_images: PMC5379804_01_AJNS-12-51-g004.jpg
case_images: F4
case_images: It was soft yellow and, in parts, cystic consistent with classic schwannoma [Figure 4].