title: An ectopic meningioma in nasal floor.
abstract: OBJECTIVE
  Primary ectopic meningioma is a rare tumor and is usually limited to the paravertebral soft tissues. The aim of this study was to assist in the diagnosis and treatment of the tumor.
  
  
  METHODS
  A 16-year-old boy presented with a nasal floor mass. The computed tomographic scan suggested a neoplastic mass lesion in the nasal floor region, and primary diagnosis is sebaceous cyst. The patient received a surgical resection, and the histologic examinations showed that the lesion was characterized with spindle cells. Immunohistochemical staining showed that the tumor cells presented intense reactivity for epithelial membrane antigen and vimentin. Histologic examination and immunohistochemical staining confirmed the diagnosis of extracranial ectopic meningioma.
  
  
  RESULTS
  The patient received a radical surgical and immediate restoration of adjacent flap, and the patient fully recovered 1 week later.
  
  
  CONCLUSIONS
  The case highlights the fact that despite its rarity, ectopic meningioma should be considered as a differential diagnosis of any mass lesion in the head and neck region, especially when spindle cells are histologically observed.
authors: From the *Department of Oral and Maxillofacial Surgery, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu; and †Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine; and ‡Shanghai Key Laboratory of Stomatology, Shanghai, China.
authors: Xi-Hu
authors: XH
authors: Yang
authors: Liu
authors: L
authors: Liu
authors: Ping
authors: P
authors: Zhang
authors: Yong-Jie
authors: YJ
authors: Hu
mesh_terms: D000293:Adolescent; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008577:Meningeal Neoplasms / Q000175:diagnosis* / Q000601:surgery; D008579:Meningioma / Q000175:diagnosis* / Q000601:surgery; D009669:Nose Neoplasms / Q000175:diagnosis* / Q000601:surgery; D013517:Otorhinolaryngologic Surgical Procedures / Q000379:methods; D014057:Tomography, X-Ray Computed