scholarly journals Cyst Formation and Enlargement Following Gamma Knife Surgery for Arteriovenous Malformation

2013 ◽  
Vol 41 (6) ◽  
pp. 447-451
Author(s):  
Takashi SHUTO ◽  
Shigeo MATSUNAGA ◽  
Shigeo INOMORI ◽  
Hideyo FUJINO
Keyword(s):  
Arteriovenous Malformation ◽  
Gamma Knife ◽  
Cyst Formation ◽  
Gamma Knife Surgery

scholarly journals The Recurrence of Cyst Formation Following Gamma Knife Surgery for Arteriovenous Malformation

2020 ◽  
Vol 48 (2) ◽  
pp. 145-148
Author(s):  
Natsuki KOBAYASHI ◽  
Takashi SHUTO ◽  
Shigeo MATSUNAGA ◽  
Kosuke ISHIKAWA ◽  
Yuko GOBAYASHI ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Gamma Knife ◽  
Cyst Formation ◽  
Gamma Knife Surgery

scholarly journals Moyamoya Syndrome Associated With Gamma Knife Surgery for Cerebral Arteriovenous Malformation

2012 ◽  
Vol 52 (5) ◽  
pp. 343-345 ◽  
Author(s):  
Yoichi UOZUMI ◽  
Masaki SUMITOMO ◽  
Mikio MARUWAKA ◽  
Yoshio ARAKI ◽  
Takashi IZUMI ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Gamma Knife ◽  
Cerebral Arteriovenous Malformation ◽  
Gamma Knife Surgery ◽  
Moyamoya Syndrome

Long-term complications after gamma knife surgery for arteriovenous malformations

2005 ◽  
Vol 102 (Special_Supplement) ◽  
pp. 34-37 ◽  
Author(s):  
Masahiro Izawa ◽  
Motohiro Hayashi ◽  
Mikhail Chernov ◽  
Koutarou Nakaya ◽  
Taku Ochiai ◽  
...  
Keyword(s):  
Gamma Knife ◽  
Arteriovenous Malformations ◽  
Cyst Formation ◽  
Gamma Knife Surgery ◽  
Content Type ◽  
Delayed Hemorrhage ◽  
Complete Obliteration ◽  
Risk Of Hemorrhage ◽  
Fine Print

Object. The authors analyzed of the long-term complications that occur 2 or more years after gamma knife surgery (GKS) for intracranial arteriovenous malformations (AVMs). Methods. Patients with previously untreated intracranial AVMs that were managed by GKS and followed for at least 2 years after treatment were selected for analysis (237 cases). Complete AVM obliteration was attained in 130 cases (54.9%), and incomplete obliteration in 107 cases (45.1%). Long-term complications were observed in 22 patients (9.3%). These complications included hemorrhage (eight cases), delayed cyst formation (eight cases), increase of seizure frequency (four cases), and middle cerebral artery stenosis and increased white matter signal intensity on T2-weighted magnetic resonance imaging (one case of each). The long-term complications were associated with larger nidus volume (p < 0.001) and a lobar location of the AVM (p < 0.01). Delayed hemorrhage was associated only with incomplete obliteration of the nidus (p < 0.05). Partial obliteration conveyed no benefit. Delayed cyst formation was associated with a higher maximal GKS dose (p < 0.001), larger nidus volume (p < 0.001), complete nidus obliteration (p < 0.01), and a lobar location of the AVM (p < 0.05). Conclusions. Incomplete obliteration of the nidus is the most important factor associated with delayed hemorrhagic complications. Partial obliteration does not seem to reduce the risk of hemorrhage. Complete obliteration can be complicated by delayed cyst formation, especially if high maximal treatment doses have been administered.

scholarly journals A case of obstructive hydrocephalus by aqueduct stenosis following gamma knife surgery for arteriovenous malformation around the pineal body

Nosotchu ◽  
2017 ◽  
Vol 39 (5) ◽  
pp. 365-369
Author(s):  
Yusuke Funakoshi ◽  
Tetsuhisa Yamada ◽  
Yoshihiro Natori ◽  
Naoyuki Imamoto ◽  
Daisuke Inoue ◽  
...  
Keyword(s):  
Arteriovenous Malformation ◽  
Gamma Knife ◽  
Obstructive Hydrocephalus ◽  
Gamma Knife Surgery ◽  
Pineal Body ◽  
Aqueduct Stenosis

scholarly journals Proposed mechanism for cyst formation and enlargement following Gamma Knife Surgery for arteriovenous malformations

2012 ◽  
Vol 117 (Special_Suppl) ◽  
pp. 135-143 ◽  
Author(s):  
Takashi Shuto ◽  
Makoto Ohtake ◽  
Shigeo Matsunaga
Keyword(s):  
Gamma Knife ◽  
Arteriovenous Malformations ◽  
Brain Area ◽  
Cyst Formation ◽  
Gamma Knife Surgery ◽  
Mr Images ◽  
Complete Obliteration ◽  
Rosai Hospital ◽  
Hemosiderin Deposits ◽  
Adjacent Brain

Object The authors retrospectively studied the mechanism of cyst formation and enlargement after Gamma Knife surgery (GKS) for arteriovenous malformations (AVMs). Methods Eighteen patients in whom cyst formation developed following GKS for AVM were retrospectively identified among 775 patients who underwent GKS for AVM at Yokohama Rosai Hospital. The study group was composed of 12 male and 6 female patients ranging in age from 17 to 47 years. Results Chronic encapsulated expanding hematoma was associated with the cyst in 5 patients. The AVM nidus volume at the time of GKS ranged from 1.9 to 36 cm3, and the prescription radiation dose was 18–25 Gy. Complete obliteration of the AVM nidus was obtained in 13 patients and partial obliteration in 5 patients. Cyst formation was detected between 2.6 and 15 years after GKS. Craniotomy was performed in 10 patients, including 2 patients in whom the incompletely obliterated nidus was removed at the same time, and an Ommaya reservoir was placed in 2 patients. Spontaneous regression of the cyst was observed in 1 patient. Serial MR imaging was performed in the other patients because the size of the cyst was stable or the lesion was asymptomatic. Histological examination of the cyst wall revealed linear hemosiderin deposits with gliosis. The nodular lesion, which was enhanced on MR images, contained granulation tissue with chronic hemorrhage from newly developed capillary vessels. Conclusions Cysts developing after GKS for AVM enlarge mainly due to repeated minor hemorrhages from a reddish nodular angiomatous lesion that develops within an adjacent brain area. Thus, the optimal treatment is wide opening of the cyst with removal of the associated angiomatous lesion by craniotomy.

scholarly journals Multi-staged Embolization and Repeated Gamma Knife Surgery for Large Cerebral Arteriovenous Malformation: A Case Report

2012 ◽  
Vol 40 (1) ◽  
pp. 49-54
Author(s):  
Hiroyuki MORISHIMA ◽  
Takashi SAKURAI ◽  
Hidemichi ITO ◽  
Daisuke WAKUI ◽  
Takashi SHUTO ◽  
...  
Keyword(s):  
Case Report ◽  
Arteriovenous Malformation ◽  
Gamma Knife ◽  
Cerebral Arteriovenous Malformation ◽  
Gamma Knife Surgery
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