Presentation
Long-standing but worsening hearing loss.
Patient Data
Extra-axial left cerebellopontine angle mass centered on the petrous ridge with dural tail. Extends to the posterior edge of the internal acoustic meatus but not in with the 7th/8th nerves appearing stretched across the anterior aspect of the mass. It demonstrates homogeneous enhancement.
Case Discussion
The differential diagnosis of cerebellopontine angle masses include vestibular schwannoma (most common), meningioma, and epidermoid cyst. This patient had the mass excised.
Histopathology
Microscopic description: The sections show a moderately cellular meningioma. The tumor forms whorls. No sheeting arrangement is seen. The tumor cells have ovoid nuclei with no nuclear pleomorphism. Mitoses are inconspicuous. There is no necrosis. No brain parenchyma is present. No evidence of atypical or malignant change is identified.
Final diagnosis: Left cerebellopontine angle tumor: meningioma (WHO grade I).
This is centered is centered posteriorly to the internal acoustic meatus, and has imaging characteristics that are characteristic of a meningioma.
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