A case wherein transoral carotid ultrasonography was performed before and after stent-assisted coil embolization for a pseudoaneurysm of the cervical internal carotid artery

An 80-year-old woman was diagnosed with acute middle cerebral artery occlusion and underwent mechanical thrombectomy (MT). The iatrogenic arterial dissection formed in the cervical internal carotid artery during MT. This was observed because there was no stenosis or extravasation. On follow-up, a pseudoaneurysm was observed; therefore, stent-assisted coil embolization was performed to prevent rupture and thromboembolism. Although computed tomography angiography was not useful for post-treatment evaluation due to metal artifacts, transoral carotid ultrasonography (TOCU) confirmed that the lumen of the stent was well delineated and there was no blood flow within the coil-filled mass. TOCU is therefore useful in the diagnosis and post-treatment evaluation of pseudoaneurysms.