頭蓋内顔面神経由来混成神経鞘腫瘍（hybrid nerve sheath tumor）の1例

A case of hybrid nerve sheath tumor of the intracranial facial nerve origin

混成神経鞘腫瘍（hybrid nerve sheath tumor：HNST）は，schwannoma，neurofibroma，perineuriomaのうち2つ以上の病理学的特徴をもつ良性神経鞘腫瘍である^1）。好発部位は皮膚軟部組織であるが，眼窩，口腔内，消化管，脳神経などで報告されている^2）。今回我々は，非常にまれな頭蓋内顔面神経由来のHNSTを経験したため報告する。

We report a case of hybrid nerve sheath tumor（HNST）located in the right internal auditory canal in a woman in her 30s. This tumor showed a high T1WI signal due to hemorrhage, which required differentiation from melanin-containing tumor or tumor with a high frequency of hemorrhage. However, if there is no bone destruction, no enhancing effect and a long history of the disease, a benign mass, especially HNST, should be considered.