title: [Morphological typing of the middle cerebral artery M1 segment by magnetic resonance angiography].
abstract: OBJECTIVE
  To study the morphology of middle cerebral artery (MCA) M1 segment.
  
  
  METHODS
  We selected the MRA data of 794 MCA (400 of the left side and 394 of the right side) from January 1, 2011 to June 30, 2011 consecutively and analyzed the morphology of the MCA M1 segment in axial, anteroposterior and lateral view, measured the length of the M1 segment, and analyzed the similarity of the left and right side M1 segment morphology.
  
  
  RESULTS
  In axial, anteroposterior and lateral view, the MCA M1 segment showed C-shape > L-shape > S-shape. In axial view, it was about 373 (47%) M1 segment performance for the C-shape, of which 340 (42.8%) M1 segments showed bowing to the dorsal side, only 33 (4.2%) M1 segments showed bowing to the ventral side. In anteroposterior view, it was about 322 (40.6%) M1 segments of the performance of the C-shape, of which 262(33.0%) M1 segments showed a bowing to the superior, 60 (7.6%) showed bowing to the inferior. The similarity of the left and right MCA M1 segments was 27.2% (114/419) in axial view and 42.7% (179/419) in anteroposterior view. It was more similar in anteroposterior view than in axial view. Along with the increase of age, in the axial view, L-shape converted to C-shape very obviously, but only mildly elevated in S-shape. In anteroposterior view, the L-shape converted to the C-shape or S-shape along with the increase of age.
  
  
  CONCLUSIONS
  The different morphology of MCA M1 segment in axial and anteroposterior view may be involved in the development of intracranial atherosclerosis.
authors: Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing 100191, China.
authors: Jin-tao
authors: JT
authors: Han
authors: Biological and Medical Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China.
authors: Hui-ting
authors: HT
authors: Qiao
authors: Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing 100191, China.
authors: Xuan
authors: X
authors: Li
authors: Department of Neurology, Peking University Third Hospital, Beijing 100191, China.
authors: Xiao-gang
authors: XG
authors: Li
authors: Department of Radiology, Peking University Third Hospital, Beijing 100191, China.
authors: Qing-yuan
authors: QY
authors: He
authors: Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing 100191, China.
authors: Guo-xiang
authors: GX
authors: Dong
authors: Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing 100191, China.
authors: Jun
authors: J
authors: Fu
authors: Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing 100191, China.
authors: Jing-yuan
authors: JY
authors: Luan
authors: Department of Interventional Radiology and Vascular Surgery, Peking University Third Hospital, Beijing 100191, China.
authors: Chang-ming
authors: CM
authors: Wang
mesh_terms: D002533:Cerebral Angiography; D006801:Humans; D002537:Intracranial Arteriosclerosis; D018810:Magnetic Resonance Angiography; D020768:Middle Cerebral Artery / Q000033:anatomy & histology*