PMC8077657_01
MR and CT angiography scans of case 1. a MR (T1-weighted images with gadolinium contrast in axial cut) showing two hyperintense intraparenchymal lesions in the fronto-mesial region. b CT angiography (3D reconstruction) showing an aneurysm of ACom (yellow arrow). c Postoperative CT angiography (3D reconstruction) with successfully closed aneurysm ACom (clip - green). L, left side; R, right side.
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F1
A multilocular lesion was found in the fronto-mesial region and interpreted as an infection or a tumor (a hyperdensity in a T1 and T2, with no enhancement after contrast application) (Fig. 1a). Our review of the MRI scans raised a suspicion of a small intracerebral clot from an ACom aneurysm rupture, and we recommended a CT angiography which showed a small ACom aneurysm (Fig. 1b). The postoperative CT angiography showed a complete closure of the aneurysm (Fig. 1c).
PMC8077657_02
MR and CT angiography scans of case 2. a MR (T1-weighted images with gadolinium contrast in axial cut) showing two hyperintense intraparenchymal lesions in the fronto-mesial region. b Angiography (3D reconstruction) showing an aneurysm of ACom (yellow arrow). c Postoperative CT angiography (coronary cut) with successfully closed aneurysm ACom (clip - green arrow). L, left side; R, right side.
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F2
A lymphoma or a high-grade glioma was suspected (high T2 signal, higher T1 signal, slight contrast enhancement, slight diffusion restriction) (Fig. 2a). ACom aneurysm (Fig. 2b). A microsurgical treatment was indicated and the aneurysm was clipped by a single clip. Eight days after the surgery, the CT angiography confirmed a complete closure of the aneurysm (Fig. 2c).