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Thirty-eight cases of giant serpentine aneurysms (GSA), including 17 GSA of the middle cerebral artery (MCA), were reviewed in the literature. The treatment possibilities of GSA of the MCA are discussed together with our own case who was a 39-year-old male with a GSA of the right MCA and was treated only by STA-MCA anastomosis. The pathogenetic mechanism of progressive enlargement of the aneurysm is also discussed.

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The authors describe the histopathological findings in a case involving rerupture of a recanalized aneurysm of the internal carotid artery 8 months after partial (95%) embolization with interlocking detachable coils. The aneurysm was filled with poorly organized thrombus, and its orifice was devoid of endothelial cells. It appears likely that a long period of observation may be required to confirm the complete thrombotic organization of coil-embolized aneurysms. This indicates that caution is needed because rupture may follow recanalization of the aneurysm.