ANEURYSMS OF THE CEREBRAL VESSELS CAUSE SUBARACHNOID HEMORRHAGE. MICRONEUROSURGICAL CLIPPING ELIMINATES DEFINITIVE THE RISK OF RERUPTURE, ENABLES TO TREAT VASOSPASMS AND ELIMINATES THE NEED FOR RE-ANGIOGRAPHIES. INTRAOPERATIVE PUNCTURE CHECKS IMMEDIATLY THE ELIMINATION OF THE ANEURYSM.