Acoustic schwannoma

Case contributed by A.Prof Frank Gaillard

Presentation

Hearing loss on the right.

Patient Data

Age: 32
MRI

Within the right cerebellopontine angle is and a lobulated mass which is of intermediate to high T2 signal, demonstrates vivid but somewhat heterogeneous contrast enhancement and facilitated diffusion. It is clearly extra-axial and centred on the internal acoustic meatus with however only minimal extension within. There is no convincing attachment to the dura. The middle cerebral peduncle is significantly distorted, and the trigeminal nerve is displaced above the mass.

Conclusion: Large right cerebellopontine angle mass presumably represents an acoustic schwannoma.

Case Discussion

The patient went on to have a resection. 

Histology

MICROSCOPIC DESCRIPTION: The sections show a moderately cellular schwannoma. It mainly contains Antoni A areas with fascicles of spindle cells. There is focal palisading but Verocay body formation is inconspicuous. A small amount of Antoni B areas with microcystic change is also seen. The tumour cells show no significant nuclear pleomorphism. Mitoses are inconspicuous. No evidence of malignancy is identified.

FINAL DIAGNOSIS: Schwannoma.

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Case information

rID: 57574
Case created: 2nd Jan 2018
Last edited: 9th Jan 2018
Inclusion in quiz mode: Included

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