Can Convexity Subarachnoid Hemorrhage be Caused by Rupture of a Saccular Aneurysm?

A 51-year-old female came to emergency service with the complaint of a sudden-onset, one-hour-duration long, witnessed episode of aphasia. No headache was declared. When she arrived to the hospital three hours later, she had no symptoms. Her neurological examination was normal. Medical history elicited alcoholism, heavy cigarette smoking, and depression. She used irregularly quetiapine, diazepam, paroxetine, and mirtazapine for a long time. An emergent head CT, obtained four hours after symptom onset, showed a subarachnoid convexity hemorrhage (cSAH) located in the precentral sulcus of the frontal lobe. There was no subarachnoid hyperdensity within the Sylvian and basal cisterns