Sellar Aneurysm with Chiasmal Compression

This is a case of aneurysm of the internal carotid artery, invading the sella and complicated by chiasmal compression and bitemporal hemianopia. Figure 1 : Humphrey visual fields (gray scale and pattern deviations) Figure 2a : T1-weighted axial brain MRI (1): well defined circular intracerebral mass Figure 2b : T1-weighted axial brain MRI (2): T1 crescent-shaped hypersignal in the wall of the lesion suggesting recent intramural hemorrhage (yellow arrow) Figure 2c : T1-weighted axial brain MRI (3): note the pulsation artifact Figure 2d: T1-weighted axial brain MRI (4): note the pulsation artifact (yellow arrows) Figure 3a: T2-weighted (FLAIR) axial brain MRI (1): heterogenous hypersignal within the lesion, consistent with a clot in the aneurysm lumen. Figure 3b: T2-weighted (FLAIR) axial brain MRI (2): heterogenous hypersignal within the lesion, consistent with a clot in the aneurysm lumen. Figure 4: T2-weighted axial brain MRI: mass effect on the chiasm Figure 5a: Brain MRI wi