PMC8248007_01
Cerebral angiogram of the left ICA, showing the 18 mm intracavernous fusiform aneurysm.
SNI-12-225-g001.jpg
PMC8248007_01_SNI-12-225-g001.jpg
F1
This unruptured, partially thrombosed aneurysm was confirmed on diagnostic cerebral angiography, [Figure 1].
PMC8248007_02
PMC8248007_03
Conventional unenhanced CT showing diffuse subarachnoid hyperdensity of the left cerebral hemisphere.
SNI-12-225-g002.jpg
PMC8248007_03_SNI-12-225-g002.jpg
F2
CT, which is standard first-line radiographic assessment to assess for a postoperative complication. CT showed diffuse subarachnoid hyperdensity of the left cerebral hemisphere, shown in [Figure 2].
(a) Images from dual-energy CT. Conventional CT images again illustrating diffuse subarachnoid hyperdensity of the left cerebral hemisphere. (b) Iodine map, illustrating the ability to isolate only iodine contrast material as this has a single density that differs to that of hemorrhage. (c) Virtual nonenhanced image, where iodine contrast material identified on iodine map has been removed. Therefore, as showing no residual hyperdensity, this illustrates that it was all contrast material extravasation.
SNI-12-225-g003.jpg
PMC8248007_03_SNI-12-225-g003.jpg
F3
The use of dual-energy CT is illustrated in [Figure 3]. [Figure 3a] shows conventional CT images, whereas [Figure 3b] illustrates the iodine map. Iodine contrast can then be removed to create a virtual nonenhanced image, shown in [Figure 3c].
Conventional unenhanced CT performed 24 h post procedure showing resolution of hyperdensity.
SNI-12-225-g004.jpg
PMC8248007_03_SNI-12-225-g004.jpg
F4
Follow-up conventional CT imaging shown in [Figure 4] was performed the following day and confirmed this diagnosis, as all hyperdensity had resolved, in keeping with contrast medium extravasation.
PMC8248007_04
PMC8248007_05