title: An immunohistochemical study of sinonasal hemangiopericytoma.
abstract: We present herein the imaging and pathological features of a 28-year-old male with a sinonasal hemangiopericytoma-like tumor occupying the left nasal meatus. At the initial visit, a nasal polyp was suspected, but, as the patient was bleeding readily, an angiomatoid lesion was also regarded as a possible diagnosis. Based on a thorough histopathological analysis, a sinonasal hemangiopericytoma-like tumor was diagnosed. Hematoxylin and eosin staining also showed a mild degree of nuclear pleomorphism and a slight increase in mitotic activity, and immunohistochemical studies using anti-CD34, MIB-1, and Vimentin antibodies were useful for distinguishing the hemangiopericytoma-like tumor from true hemangiopericytoma and a solitary fibrous tumor.
authors: Department of Otorhinolaryngology, Juntendo University School of Medicine, Tokyo, Japan. h-yokoi@ks.kyorin-u.ac.jp
authors: Hidenori
authors: H
authors: Yokoi
authors: Atsushi
authors: A
authors: Arakawa
authors: Kyoko
authors: K
authors: Kuribayashi
authors: Ayako
authors: A
authors: Inoshita
authors: Takuo
authors: T
authors: Haruyama
authors: Katsuhisa
authors: K
authors: Ikeda