title: Endoscopic endonasal excision of nasal chondromesenchymal hamartoma with intracranial extension.
abstract: BACKGROUND
  Nasal chondromesenchymal hamartoma (NCMH) is an extremely rare benign hamartoma of the sinonasal tract, predominantly involving infants and young children.
  
  
  METHODS
  We report the case of a 3-year-old boy of NCMH with extension to anterior skull base.
  
  
  RESULTS
  The tumor was completely resected piece by piece via an endonasal endoscopic approach. There is no recurrence 3 years after operation.
  
  
  CONCLUSIONS
  We reported the case of NCMH extending to skull base was successfully resected by endonasal endoscopic approach.
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Tokyo Metropolitan Tama Medical Center, 2-8-29 Musashidai, Fuchu-shi, Tokyo 183-8524, Japan; Department of Otolaryngology, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo 183-8561, Japan. Electronic address: muneo@jcom.home.ne.jp.
authors.forename: M
authors.initials: M
authors.lastname: Nakaya
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Tokyo Metropolitan Tama Medical Center, 2-8-29 Musashidai, Fuchu-shi, Tokyo 183-8524, Japan; Department of Otolaryngology, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo 183-8561, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Yoshihara
authors.affiliation: Department of Otolaryngology, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo 183-8561, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Yoshitomi
authors.affiliation: Department of Otolaryngology, Tokyo Metropolitan Children's Medical Center, 2-8-29, Musashidai, Fuchu-shi, Tokyo 183-8561, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Baba
mesh_terms: D002675:Child, Preschool; D003937:Diagnosis, Differential; D006222:Hamartoma / Q000473:pathology / Q000601:surgery*; D006801:Humans; D008297:Male; D057605:Natural Orifice Endoscopic Surgery / Q000379:methods; D009668:Nose Diseases / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome
keywords: Endoscopic surgery; Nasal chondromesenchymal hamartoma (NCMH); Sinonasal tumor; Skull base