During the procedure the microcatheter via 17 could only be placed with huge difficulties within the aneurysm sack due to the location at the junction of basilar artery, posterior cerebral artery and superior cerbral artery.While advancing the web-device, delivered through a via 17, the microcatheter could not be kept accurate in a optimal position for a good deployment of the device.While manipulating the overall system to achieve a perfect placement of the web, either the tip of the microcatheter or the distal tip of the partially deployed web device perforated the aneurysm and caused bleeding.Aneurysm ruptured and caused bleeding for approximately 15 minutes while the bleeding could be stopped through implanting 4 coils.
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