title: A case of metastatic brain tumor in the perfusion territory of superficial temporal artery-middle cerebral artery anastomosis.
abstract: BACKGROUND
  We report a rare case of metastatic tumor in the perfusion territory of superficial temporal artery-middle cerebral artery (STA-MCA) anastomosis.
  
  
  METHODS
  A 63-year-old man, who had undergone left STA-MCA anastomosis in the treatment of occlusion of internal carotid artery 4 years ago, presented with a hyperintense lesion on T2-weighted image in the left frontal lobe, the perfusion territory of the prior bypass. Follow-up magnetic resonance imaging 1 month later showed enhanced tumor within the T2 hyperintense lesion. A total removal of the tumor through another craniotomy was performed. The pathologic diagnosis was metastatic carcinoma.
  
  
  CONCLUSIONS
  This is the first report of the metastatic carcinoma by seeding of tumor cells through STA-MCA bypass flow.
authors.affiliation: Department of Neurosurgery, Clinical Research Institute, National Hospital Organization, Kyushu Medical Center, Iizuka, Japan ; Department of Neurosurgery, Shimonoseki Municipal Hospital, Shimonoseki, Yamaguchi, Japan.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Fujioka
authors.affiliation: Department of Neurosurgery, Clinical Research Institute, National Hospital Organization, Kyushu Medical Center, Iizuka, Japan.
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Hata
authors.affiliation: Department of Neurosurgery, Clinical Research Institute, National Hospital Organization, Kyushu Medical Center, Iizuka, Japan.
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Sangatsuda
authors.affiliation: Department of Neurosurgery, Clinical Research Institute, National Hospital Organization, Kyushu Medical Center, Iizuka, Japan ; Department of Neurosurgery, Aso Iizuka Hospital, Iizuka, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Inoue
authors.affiliation: Department of Neurosurgery, Japanese Labour Health Welfare Organization, Kyushu Rosai Hospital, Fukuoka, Japan.
authors.forename: Sei
authors.initials: S
authors.lastname: Haga
authors.affiliation: Department of Neurosurgery, Clinical Research Institute, National Hospital Organization, Kyushu Medical Center, Iizuka, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Nagata
keywords: Metastatic brain tumor; N-isopropyl-p-[123I] iodoamphetamine single photon emission computed tomography; superficial temporal artery-middle cerebral artery anastomosis