Operative Technique for Resection of a Ventral Transdural Retro-Odontoid Pannus: A 2-Dimensional Operative Video.

Background: Retro-odontoid pseudotumors are rare inflammatory complications of atlantoaxial instability often associated with cervical degenerative disease and rheumatoid arthritis. While propagation of these lesions has been shown to cause spinal cord compression and cervical myelopathy, intradural extension has rarely been reported.

Methods: In this manuscript and 2-dimensional illustrative intraoperative video, we demonstrate cervical decompression, removal of the intradural component, and stabilization with C1-2 instrumentation using a posterior approach. A 71-year-old patient presented with progressive cervical myelopathy. Preoperative imaging demonstrated a large retro-odontoid pannus causing severe spinal cord compression and an associated contrast-enhancing intradural lesion, in the absence of obvious C1-2 instability or fractures on computed tomography scan. C1-2 posterior decompression and fusion were performed with maximally safe intradural pannus resection and ventral dural reconstruction.

Results: Postoperatively, the patient experienced significant improvement in myelopathic symptoms. Imaging demonstrated good spinal cord decompression with complete intradural pannus resection and debulking of the extradural component.

Conclusions: Our outcome in this rare complication suggests a posterior approach may be effective in treating similar patients.