Fig. 3

Plain CT scan head demonstrate hyper density (bleed) in the left gyrus rectus and adjacent basifrontal gyrus with subarachnoid hemorrhage in the interhemispheric fissure a. Reconstructed image of CT angiogram demonstrates a superiorly directed A- comm artery aneurysm (red star) with dominant right A1 b. Intraoperative images after right pterional craniotomy c and d demonstrates ipsilateral RAH (purple arrow) running parallel to the ipsilateral A1 (red arrow). After successful micro neurosurgical dissection, the ipsilateral A2 is identified and is well depicted in the image as the source of origin for RAH