A Rare Entity of S100(−)/cluster of Differentiation 68(+) Jaw Myxoid-Cellular Neurothekeoma: A Case Report and Literature Review

Neurothekeomas are rare, benign soft tissue tumors with fairly distinctive histomorphological features. They arise from the nerve sheath (nerve sheath myxoma/myxoid type) or fibrohistiocytic matrix (cellular type) and commonly involve the face, neck, and upper extremities in young adults. We report a rare, mixed-type neurothekeoma (showing both myxoid and cellular features), affecting the jaw of an 11-year-old girl. Histology was consistent with typical myxoid pattern, while immunohistochemistry suggested a fibrohistiocytic origin (cellular pattern). We excised the mass completely without any evidence of recurrence after 6 months.