title: Perinidal dilated capillary networks in cerebral arteriovenous malformations.
abstract: OBJECTIVE
  The perinidal vascular structures of cerebral arteriovenous malformations were examined, to clarify their pathomorphological features.
  
  
  METHODS
  Twenty-two resected specimens of human brain structures adjacent to the nidus were examined. The vessels surrounding the nidus were three-dimensionally reconstructed with a computer graphics system.
  
  
  RESULTS
  In all cases, the analysis of serial sections revealed that perinidal dilated capillaries were located in brain tissue 1 to 7 mm from the nidal border. The vessels surrounding the nidus demonstrated markedly dilated capillary networks (perinidal dilated capillary network [PDCN]). The diameters of the vessels forming the PDCN were 10 to 25 times those of normal capillaries. The PDCN connected not only to the nidus, feeding arteries, and draining veins, via arterioles and venules, but also to the normal capillary network, arterioles, and venules.
  
  
  CONCLUSIONS
  Without exception, each nidus was accompanied by a PDCN, which connected not only to the nidus, feeding arteries, and draining veins, via arterioles and venules, but also to normal capillaries, arterioles, and venules. The PDCN should be considered in studies aimed at gaining an understanding of the mechanisms underlying the intraoperative and postoperative bleeding, growth, and recurrence of surgically treated cerebral arteriovenous malformations.
authors.affiliation: Department of Neurosurgery, Fukushima Medical University, Fukushima, Japan. sosato@fmu.ac.jp
authors.forename: Sonomi
authors.initials: S
authors.lastname: Sato
authors.forename: Namio
authors.initials: N
authors.lastname: Kodama
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Sasaki
authors.forename: Masato
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Toshihito
authors.initials: T
authors.lastname: Ishikawa
mesh_terms: D000293:Adolescent; D000328:Adult; D001921:Brain / Q000098:blood supply*; D002196:Capillaries / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D002560:Cerebrovascular Circulation / Q000502:physiology; D004108:Dilatation, Pathologic / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D021621:Imaging, Three-Dimensional; D002538:Intracranial Arteriovenous Malformations / Q000473:pathology* / Q000503:physiopathology / Q000601:surgery; D008297:Male; D008875:Middle Aged