Brain tumors, hematological diseases and vascular malformations like fistulas or arteriovenous malformations are the most well known causes of non-traumatic subdural hematoma (SDH)1 Although spontaneous subdural hematoma from ruptured intracranial aneurysm has been reported2, SDH with non radiographic evidence of subarachnoid hemorrhage is very rare3,4. Moreover, a patient with acute and bilateral spontaneous subdural hematoma secondary to ruptured left posterior communicating artery aneurysm has not been reported to date. The clinical findings and etiologic mechanisms are discussed.
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