From 1978 to 1988, 14 giant intracranial aneurysms(more than 2.4 cm in diameter) and one large aneurysm (1.5cm in diameter) were treated by extracranial/intracranial(EC/IC) bypass or cerebral artery reconstruction. Of theaneurysms, 10 were located at the intracavernous carotid ar-tery (CCA). One of the 10 anourysms was posttraumatic andlocated at both the carotid-ophthalmic artery segment and thebifurcation of the internal carotid artery (ICA). Three wereseen at the middle cerebral artery (MCA) trunk.Theaneurysms were demonstrated by angiography and CTscanning. They were treated with trapping of the aneurysm andsuperficial temporal artery (STA)/middle cerebral artery(STA-MCA) bypass with/without a graft (6 cases), cervicalICA ligation and STA-MCA bypass with / without a graft (6)aneurysm excision with an end-to-end anastomosis of theMCA and a STA-MCA bypass with a graft (1), proximal From 1978 to 1988, 14 giant intracranial aneurysms (more than 2.4 cm in diameter) and one large aneurysm (1.5 cm in diameter) were treated by extracranial / intracranial (EC / IC) bypass or cerebral artery reconstruction. Of theaneurysms, 10 were located at the intracavernous carotid ar-tery (CCA). One of the 10 anysys was was posttraumatic andlocated at both the carotid-ophthalmic artery segment and the bifurcation of the internal carotid artery (ICA). Three wereseen at the middle cerebral artery (MCA) trunk. Theaneurysms were demonstrated with angiography and CTscanning. The were treated with trapping of the aneurysm andsuperficial temporal artery (STA) / middle cerebral artery (STA-MCA) bypass with / without a graft (6 cases), cervicalICAligation and STA- MCA bypass with / without a graft (6) aneurysm excision with an end-to-end anastomosis of the MCA and a STA-MCA bypass with a graft (1), proximal