RESUMO
The neck clipping of cerebral aneurysm is a well established treatment for the subarachnoid hemorrhage caused by aneurysmal rupture. However, incomplete clipping of an aneurysm may result in recurrent hemorrhage with serious or fatal consequence. Recently, two patients underwent reoperation for recurrent hemorrhage from the regrowth aneurysm after previous clipping operation. The technical obstacles to surgical treatment of these two patients were perianeurysmal adhesion or scar formation, presence of clip and coating agents and so on. One patient showed good outcome, another patient was dead by pneumonia. In order to detect regrowth of aneurysm, periodic examination is very important for the patient with remnant neck after aneurysm clipping operation.