title: A chronic encapsulated intracerebral hematoma mimicking a brain tumor: Findings on arterial spin labeling of MRI.
abstract: BACKGROUND
  Intracerebral hematoma usually resolves spontaneously. Chronic encapsulated intracerebral hematoma is rare and mimics a brain tumor.
  
  
  METHODS
  A 50-year-old man had developed intracerebral hematoma in the right temporal lobe. Computed tomography (CT) showed the gradually decreasing density of the hematoma. However, the hematoma did not decrease in size and it showed ring enhancement on contrast-enhanced CT for more than 1 year. Magnetic resonance imaging (MRI) revealed a lesion content showing a high intensity on both T1- and T2-weighted images with ring enhancement. The lesion was diagnosed as a chronic encapsulated intracerebral hematoma developing from an acute hematoma. Arterial spin labeling of MRI showed decreased blood perfusion even in the enhanced capsule, being different from findings of a cystic brain tumor.
  
  
  CONCLUSIONS
  Arterial spin labeling might be a useful modality to distinguish a chronic encapsulated intracerebral hematoma from a cystic hypervascular brain tumor.
authors.affiliation: Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Kamide
authors.affiliation: Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Japan.
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Seki
authors.affiliation: Department of Radiology, Yokohama Sakae Kyosai Hospital, Japan.
authors.forename: Kei-Ichiro
authors.initials: K
authors.lastname: Suzuki
authors.affiliation: Department of Radiology, Yokohama Sakae Kyosai Hospital, Japan.
authors.forename: Takae
authors.initials: T
authors.lastname: Aoki
authors.affiliation: Department of Radiology, Yokohama Sakae Kyosai Hospital, Japan.
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Hirano
authors.affiliation: Department of Radiology, Yokohama Sakae Kyosai Hospital, Japan.
authors.forename: Mitsuyuki
authors.initials: M
authors.lastname: Takahashi
authors.affiliation: Department of Neurosurgery, Yokohama Sakae Kyosai Hospital, Japan Department of Neurosurgery, Kanto Rosai Hospital, Japan nomura413jp@yahoo.co.jp.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Nomura
mesh_terms: D001932:Brain Neoplasms / Q000503:physiopathology*; D002908:Chronic Disease; D003937:Diagnosis, Differential; D006406:Hematoma / Q000000981:diagnostic imaging*; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D013113:Spin Labels; D014057:Tomography, X-Ray Computed
chemical_list: D013113:Spin Labels
keywords: Chronic encapsulated intracerebral hematoma; MRI; arterial spin labeling