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A 12-year-old girl presented with a 3-week history of left-sided hemifacial pain. Physical examination revealed hemifacial numbness, hypesthesia, and chewing weakness without signs of nevus of Ota. Neuroradiologic examinations showed a dumbbell-shaped lesion in middle and posterior fossa along the distribution of the trigeminal nerve (Figure 1). Intraoperatively, a well-defined black extra-axial lesion firmly attached to the trigeminal nerve was observed. Pathologic examination confirmed a melanocytoma (Figure 2). Extra-axial melanocytoma may have a tendency to distribute along the trigeminal nerve similar to nevus of Ota. For lesions involving the trigeminal nerve with hyperdensity on CT and hyperintensity on T1 and hypointensity in T2 imaging, melanocytoma should be considered.1
Footnotes
↵* These authors contributed equally to this work as co-first authors.
↵† These authors contributed equally to this work as co-senior authors.
Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
Submitted and editor reviewed. The handling editor was Editor-in-Chief José G. Merino, MD, MPhil, FAHA, FAAN.
- Received July 11, 2022.
- Accepted in final form September 28, 2022.
- © 2022 American Academy of Neurology
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