外耳道に発生したNanta骨性母斑例

抄録

Osteonevus of Nanta is a nevus-cell nevus associated with osteomas, that accounts for 5.6% of case of nevus-cell nevus; it commonly occurs on the face. The frequency of nevus-cell nevus is particularly high in the case of auditory canal tumors, however, to the best of our knowledge, there are no reports of external auditory canal osteonevus of Nanta. Herein, we report a case of external auditory canal osteonevus of Nanta. The patient was a 70s woman who presented with an 8-mm elastic-hard tumor in the external auditory canal. This tumor showed a high density on CT. Thus, osteonevus of Nanta should be included in the differential diagnosis in patients who present with a hyperdense tumor in the external auditory canal on CT.