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Updated: May 15, 2026

Double Direct Injection of Blood into the Cisterna Magna as a Model of Subarachnoid Hemorrhage
Published on: August 30, 2020
Perimesencephalic nonaneurysmal subarachnoid hemorrhage with unilateral third cranial nerve palsy: two case reports
Nobutake Sadamasa1, Noritaka Sano, Nobuhiko Takeda
1Department of Neurosurgery, Kurashiki Central Hospital, Kurashiki, Okayama. ns11267@kchnet.or.jp
Abstract:
Perimesencephalic nonaneurysmal subarachnoid hemorrhage (PNSAH) is a benign form of subarachnoid hemorrhage and is usually not associated with any focal deficit. We describe two rare cases of PNSAH with unilateral third cranial nerve palsy. Both patients were treated conservatively. The outcomes of our two cases were excellent. The third cranial nerve palsy resolved gradually in both patients, suggesting that the prognosis for third cranial nerve palsy concomitant with PNSAH is favorable. Unilateral third cranial nerve palsy may occur as the first clinical manifestation of PNSAH.
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