Local thrombosis in the low flow velocity area following partial coil embolization of a ruptured internal carotid artery aneurysm: case report

Abstract

Objective: A case of ruptured internal carotid artery aneurysm in which local thrombosis occurred in the low flow velocity area following partial coil embolization is presented.
Case presentation: A 91-year-old woman suffered from subarachnoid hemorrhage due to rupture of a large saccular aneurysm of the right internal carotid artery. Patient was initially treated conservatively. Rebleeding occurred within a month, which lead to coil embolization of the aneurysm. Although the aneurysm was occluded incompletely because of a large sac and a wide neck, a two-week follow-up angiography disclosed progressive local thrombosis within the aneurysm. Thrombosed area corresponded to the low flow velocity area on computerized flow dynamic analysis.
Conclusion: It is suggested that local thrombosis may occur in the area of low flow velocity after partial coil embolization of the aneurysm.