RESUMEN
We report three cases of coincidental cerebral aneurysm with pituitary tumor. In our hospital the incidence of such cases was 4.4% of 68 patients with pituitary tumors from March, 1970 to October, 1990. Cases No. 1 was a 47-year-old female suffering from progressive loss of visual acuity. Preoperative brain C-T scan and angiographies revealed unruptured posterior communicating aneurysm with pituitary tumor. Case No. 2 was a 39-year-old male suffering from headache after head trauma with acromegaly. Preoperative brain C-T scan and angiographies appeared unruptured anterior communicating aneurysm and pituitary tumor. Case No. 3 was a 62-year-old female suffering progressive loss of visual acuity and headache. Left middle cerebral artery aneurysm and pituitary tumor were found by preoperative brain C-T scan and angiographies. All cases were operated by transcranial route and performed tumor removal after primary clipping of aneurysm. Postoperatively remained tumor of all cases was treated by radiosurgery successfully.