[Oculomotor palsy caused by aneurysms at the internal carotid-posterior communicating artery junction and its prognosis following intracranial surgery (author's transl)].

Sixty-three cases of an aneurysm at the internal carotid-posterior communicating artery junction with aneurysm-induced unilateral eye-lid ptosis, a symptom of the third nerve palsy, were described. 1) The incidence of this palsy in 189 cases of the aneurysm was thirty-three percent. 2) The palsy before the aneurysm rupture was recognized in three cases (5 percent). The onset of this palsy following an aneurysm rupture was most frequent in the first day and in almost half of the patients within two days, but in four cases the palsy appeared three or four weeks after the aneurysm rupture. 3) The size and direction of the growth of the aneurysms in carotid angiograms were compared between palsy and non-palsy groups and there were no significant differences between them. 4) Thirty-one patients who had had a palsy before direct aneurysm surgery were followed one to ten years post-operatively. In twenty-three (74 percent), the unilateral eye-lid ptosis was recovered by the follow-up. In eleven of the twelve cases operated within two weeks after the onset, the palsy was recovered. On the other hand, in seven of eight not-recovered cases there was a delay of more than two weeks before operation.