JOURNAL ARTICLE
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[Application of intraoperative real-time ultrasound in the surgical treatment of cerebral arteriovenous malformation].

OBJECTIVE: To investigate the value of intraoperative real-time ultrasound during surgery of cerebral arteriovenous malformations (AVMs).

METHODS: Thirteen patients with cerebral AVMs, 12 supratentorial and 1 infratentorial, underwent microsurgical treatment. Intraoperative ultrasound (IOUS) with multimodality was performed before the starting of resection in order to: (1) localize and delineate the AVM, (2) differentiate the embolized and perfused parts of AVM, and (3) identify the feeding arteries and draining veins. After removal of the lesion, sonographic examination was repeated to detect the residual AVM tissue and the findings were compared with the intra- and/or post-operative angiographic finding.

RESULTS: Total resection was achieved in all 13 patients with AVM under real-time ultrasonographic navigation. The niduses of AVM were localized and defined precisely by IOUS due to their dichromatic flow pattern. The embolized parts of AVM exhibited hyperechogenicity without blood signals. The feeding and draining vessels were distinguished from normal ones morphologically and hemodynamically. Complete removal of the AVM determined sonographically was then confirmed by angiography.

CONCLUSIONS: Intraoperative real-time ultrasound allows accurate localization and navigation of the cerebral AVMs, provides valuable information during surgery, and helps determine the degree of removal of the cerebral AVM.

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