Case Report A Solitary Malignant Schwannoma in the Choana and Nasal Septum

which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Malignant schwannoma is an extremely rare tumor and the risk of malignant schwannoma increases in patients with von Recklinghausen’s disease. Recently, we encountered a case of solitary malignant schwannoma in the choana and posterior nasal septum.Malignant schwannoma has not been previously reported in these locations. A 53-year-oldman, whowas immunologically healthy and showed no abnormal dermatological lesions, presented with a polypoid mass in the right nasal cavity and underwent endoscopic mass excision.Themass originated from the choana and the posterior portion of the right nasal septum.This mass was confirmed as amalignant schwannoma on histological examination and immunohistochemical staining. After endoscopic excision, postoperative adjuvant radiotherapy was administered, and there was no recurrence at 1 year after treatment.This case suggests that a solitary malignant schwannoma should be considered in the differential diagnosis of a mass in the posterior nasal cavity. 1