 Postsurgical changes of right L5 and S1 hemilaminotomies are seen for resection of osseous lesion at the S1 level on the right. There appears to be resection of at least majority of the lesion including component extending medially extradurally in the lateral aspect of the spinal canal at S1. Rind of bone at the S1 level is seen projecting into the spinal canal which may represent normal/reactive residual bone or possibly small residual medial component of the lesion. Edema within the right S1 pedicle has not significantly changed from the prior study and is likely postprocedural and/or related to previously noted S1 lesion. Alignment is anatomic. There are no fractures or subluxations. The marrow signal is benign. No areas of abnormal enhancement are present. The conus is normal in signal and morphology and terminates at an appropriate level. The visualized intra-abdominal and paraspinal contents are unremarkable. No spinal canal or neural foraminal narrowing.
Postsurgical changes at the right L5-S1 level for resection of right S1 lesion. There appears to be resection of at least majority of the lesion. Consider CT for better evaluation for residual bony lesion lesion.