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Figure 1: MRI brain done at the time of surgery for CSF rhinorrhea in 2015, showed a defect in the planum sphenoidale on the right side and an encephalomeningocele (a). Contrast MR sagittal and coronal images showed a normal basilar artery (b and c). A CT scan brain done after admission for meningitis in 2017, showed normal caliber of basilar artery (d). A CT brain performed on the day of ictus showed Fischer Grade 3 diffuse subarachnoid hemorrhage in basal cisterns (e). An MRI brain sagittal image (f) and CT angiogram with reconstructed coronal and sagittal images revealed the acute evolution of the basilar artery fusiform aneurysm within a period of 2 days(g-i)

Figure 1: MRI brain done at the time of surgery for CSF rhinorrhea in 2015, showed a defect in the planum sphenoidale on the right side and an encephalomeningocele (a). Contrast MR sagittal and coronal images showed a normal basilar artery (b and c). A CT scan brain done after admission for meningitis in 2017, showed normal caliber of basilar artery (d). A CT brain performed on the day of ictus showed Fischer Grade 3 diffuse subarachnoid hemorrhage in basal cisterns (e). An MRI brain sagittal image (f) and CT angiogram with reconstructed coronal and sagittal images revealed the acute evolution of the basilar artery fusiform aneurysm within a period of 2 days(g-i)