Is CT angiography necessary in perimesencephalic subarachnoid hemorrhage?
Although aneurysmal causes of PMSAH is rare, CT angiography is necessary to exclude the aneurysmal causes, as the outcome is different.
Is repeated CT angiography necessary in non-aneurysmal PMSAH?
No, the outcome of the non-aneurysmal PMSAH is very good, and the risk of rebleed is very rare, so no need to repeat the CT angiography.
The follow-up non-contrast CT study was done after one month, which showed complete resolution of the perimesencephalic SAH after conservative treatment and observation.