[A case of internal carotid artery aneurysm of the cavernous portion treated by trapping with the detachable balloon technic].

The authors report a case of internal carotid artery aneurysm of the cavernous portion, which was treated by trapping of the internal carotid artery using a detachable balloon technique. In April 1984, 56-year-old female was admitted with chief complaint of ptosis of the left eyelid lasting for the past two years. A neurological examination on admission revealed the left oculomotor nerve palsy. Contrast CT scan and left carotid angiogram showed an aneurysm at the cavernous portion of the internal carotid artery. On June 11th, three days before the trapping, superficial temporal artery-middle cerebral artery anastomosis was performed using short vein graft. On June 14th, the internal carotid artery was trapped at the distal and proximal portions of the aneurysmal neck using two Debrun's No. 16 balloons. Digital subtraction angiography taken two weeks after the trapping showed complete occlusion of the left internal carotid artery with no visualization of the aneurysm. Contrast CT scan taken three months after the trapping highly indicated complete thrombosis of the lumen of the aneurysm. Following the intravascular surgery, the left oculomotor paresis was gradually improved. The authors emphasized that the trapping of the internal carotid artery using a detachable balloon technique was the most safe and beneficial method for the treatment of the aneurysm located in the cavernous portion of the internal carotid artery.