Admission for stereotactic craniectomy and resection of cerebellopontine (CP) angle tumor. Presentation history not available.
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CP angle lesion on post gadolinium T1w axial MRI head.
Lobulated margin with peripheral enhancement. Appears to arise adjacent to jugular foramen (NOT internal auditory canal). Extra-axial in location. CN VII, VIII are displaced but not infiltrated.
No infiltration of pons, left superior cerebellar peduncle or cerebellar lobe.
This is likely to be a neurogenic tumor arising from left CN IX, X, XI rather than an acoustic neuroma. Meningioma is less likely given it does not have a broad based interface with the dura.
Other possibilities for an enhancing CP mass include: berry aneurysm, trigeminal/facial nerve schwannoma, ependymoma. Metastasis are unlikely to be extra-axial (usually parenchymal) but rarely present in this region.
The differential would also be wider if non-enhancing, hyperintense on T2w, or hyperintense on T1w. This was mostly isointense pre-contrast.