title: Intracranial Neurenteric Cyst with an Enhanced Mural Nodule and Melanin Pigmentation: Radiologic-Pathologic Correlation.
abstract: BACKGROUND
  An intracranial neurenteric cyst (NC) is a rare congenital benign lesion that usually has a well-demarcated cystic appearance without contrast enhancement on magnetic resonance imaging (MRI). In particular, an intracranial NC with an enhanced mural nodule is extremely rare.
  
  
  METHODS
  A 20-year-old man presented with left-sided hearing disturbance and headache. On MRI, a cystic mass was seen in the prepontine cistern that significantly compressed the brainstem. The lesion was hyperintense on T1-weighted images, and contained a solid component that appeared with marked hypointensity on T2*-weighted images and slight enhancement. The cystic wall was removed via a left transcondylar fossa approach. Histopathologic findings showed an NC with a solid component and melanin pigmentation. The solid component showed xanthogranulomatous changes, with evidence of an old hemorrhage, and was strongly adherent to the brainstem.
  
  
  CONCLUSIONS
  We present this rare case and emphasize that an NC should be considered in the differential diagnosis of intracranial cystic lesions with an enhanced mural nodule.
authors.affiliation: Department of Neurosurgery, University of Occupational and Environmental Health, Kitakyushu, Japan. Electronic address: yama9218@med.uoeh-u.ac.jp.
authors.forename: Junkoh
authors.initials: J
authors.lastname: Yamamoto
authors.affiliation: Department of Surgical Pathology, University of Occupational and Environmental Health, Kitakyushu, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Shimajiri
authors.affiliation: Department of Neurosurgery, University of Occupational and Environmental Health, Kitakyushu, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Akiba
authors.affiliation: Department of Neurosurgery, University of Occupational and Environmental Health, Kitakyushu, Japan.
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Nakano
authors.affiliation: Department of Neurosurgery, University of Occupational and Environmental Health, Kitakyushu, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nishizawa
mesh_terms: D016080:Arachnoid Cysts / Q000000981:diagnostic imaging* / Q000601:surgery*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods; D008297:Male; D008543:Melanins; D009436:Neural Tube Defects / Q000000981:diagnostic imaging* / Q000601:surgery*; D010858:Pigmentation; D014057:Tomography, X-Ray Computed / Q000379:methods; D055815:Young Adult
chemical_list: D008543:Melanins
keywords: Endodermal cyst; Melanin; Mural nodule; Neurenteric cyst; Xanthogranulomatous