Hybrid neurofibroma/schwannoma is a rare variant of hybrid peripheral nerve sheath tumours (HPNST). A Medline search up to December 2021 identified only six cases of this tumour in the orbit. We report the case of a 78-year-old man who presented with left exophthalmos. Computed tomography showed a left intraconal orbital mass. The clinico-radiological diagnosis was consistent with an intraconal cavernous angioma. Orbitotomy was performed, obtaining an 18×16×11mm mass. Two different morphologies were seen microscopically, diagnostic of hybrid neurofibroma/schwannoma. HPNSTs of the orbit are uncommon and most reported cases showed a hybrid neurofibroma/schwannoma morphology. Hybrid neurofibroma/schwannomas have been associated with neurofibromatosis and schwannomatosis. Local recurrences have been reported. The correct identification of these tumours is important due to their potential use as a syndromic marker.
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| http://dx.doi.org/10.1016/j.patol.2022.03.002 | DOI Listing |
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- * After surgical removal, the mass was confirmed to be a benign hybrid nerve sheath tumor containing metastatic PTC cells, which mimicked a rare type of nerve tumor known as glandular schwannoma.
- * Following surgery, the patient's nerve symptoms improved, but scans revealed progression of PTC in the lungs, leading to treatment with Lenvima, while highlighting the rare phenomenon of tumor-to-tumor metastasis (TTM) in this case.
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