Schwannoma of infratemporal fossa

Case contributed by A.Prof Frank Gaillard

Presentation

Mass.

Patient Data

Age: 40 years

Large well-defined right infratemporal soft tissue mass is T1 isointense, avidly enhancing with central areas of non-enhancement. Its medial extent is to just below the foramen ovale without intracranial extension. Laterally it extends into temporalis, abutting the base of skull which it remodels. No intracranial extension.

Conclusion: Mass most likely to represent a nerve sheath tumour. Given it's location and ascent into temporalis it is likely arising from deep temporal branches of the mandibular division of the trigeminal nerve.

Ultrasound
Under ultrasound guidance, using an 18 gauge Quickcore needle, 2 core samples of the lesion at its supra-zygomatic location immediately deep to the temporalis were performed. The lesion was entered from its anterior margin with the needle directed posteromedially. The core samples were sent in formalin for histological analysis. No immediate post procedure complications.

Case Discussion

The core biopsy confirmed the diagnosis.

Histology

MICROSCOPIC DESCRIPTION: Sections show a spindle cell tumour composed of poorly formed intersecting fascicles. There are focal pallisaded tumour nuclei, consistent with Verocay body formation. There is mild nuclear atypia with nuclear elongation and hyperchromasia. There are scattered lymphocytes, together with foamy and hemosiderin laden macrophages. No mitoses or necrosis are seen. There is no evidence of malignancy. Immunohistochemical results show tumour cells stain: S100+, SOX10+, CKAE1/3- and EMA-.

FINAL DIAGNOSIS: Schwannoma.

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Case information

rID: 48752
Case created: 22nd Oct 2016
Last edited: 23rd Oct 2016
System: Head & Neck
Inclusion in quiz mode: Included

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