Figure 1. T2-weighted sagittal and axial MRI of the lumbar spine without intravenous contrast. A giant, intradural, extramedullary, heterogeneous, lobulated, expanding tumor was found in the lumbar spine and sacrum canal. Tumor dimensions were 56.2 mm (AP)×96.5 mm (LL)×19.0 mm (craniocaudal). Starting from the L5-S1 level, there was significant erosion of the sacrum, lateral masses more on the left side, expanding the channel, as well as openings with the spread of the presacral and in the back muscles with the incoming nerve root and plexus displacement.