Migration of lipiodol into lateral ventricles after embolization of cerebral arteriovenous malformation: a case report.

N-butyl cyanoacrylate (NBCA) has been used to embolise brain arteriovenous malformations (AVMs) for over 30 years. It is a mixed with lipiodol in varying proportions. We report a 22-year-old male with intraventricular hemorrhage from a ruptured intranidal AVM aneurysm in the left temporal lobe. The intranidal aneurysm and the nidus were successfully embolized using a 20% NBCA and lipiodol mixture without any complications according to computed tomography (CT) immediately after treatment. Scattered high-density spots were observed in both lateral ventricles on CT 5 days after embolization, suggesting migration of lipiodol. We speculated that the aneurysm was a pseudoaneurysm whose wall protruded into the inferior horn of the left lateral ventricle, and the lipiodol in the NBCA migrated into the ventricles after the thin part of the wall ruptured. The patient developed pyrexia due to chemical meningitis, which responded to steroid treatment for one month.

A case of fibromuscular dysplasia related intracerebral hemorrhage without angiographically cerebral abnormal vessels.

BACKGROUND: Fibromuscular dysplasia (FMD) can cause cerebral aneurysms and dissection, which can lead to stroke. Angiographic findings are important in the diagnosis. We report a case of FMD in which the cause of hemorrhage could not be determined by angiography. CASE DESCRIPTION: A 73-year-old woman suffered from intracerebral hemorrhage (ICH) associated with FMD without abnormal angiography cerebral vessels. She presented with headache and nausea. Subsequent head-computed tomography-revealed ICH in the left frontal lobe, and contrast-enhanced magnetic resonance imaging revealed a gadolinium-enhancing lesion in the perihematoma area and in the genu of the corpus callosum. Although cerebral angiography revealed a string of beads appearance in the bilateral extracranial internal carotid arteries, no abnormality explaining the hemorrhage was identified. The hematoma was removed and the pathological diagnosis was FMD. In the pathological specimen, various patterns of vulnerable vessels, such as aneurysmal dilatation and obstruction, were observed, which could easily collapse and result in hemorrhage. In the case of ICH of unknown origin, microscopic vessel disruption due to FMD should also be considered. CONCLUSION: FMD can cause ICH in microscopic vascular lesions that are undetectable on angiography.

Massive intracerebral hemorrhages due to peripheral middle cerebral artery aneurysm rupture: A case report with a surgical video.

BACKGROUND: Saccular aneurysm in the distal segment of the middle cerebral artery (DMCA) occurs very rarely and often represents with a rupture. We report a successful surgical case of a DMCA aneurysm rupture with large cerebral and subarachnoid hemorrhage. CASE DESCRIPTION: A 44-year-old female presented a sudden onset headache and coma (the Glasgow Coma Scale was 3). Head computed tomography (CT) revealed a subarachnoid hemorrhage around the right Sylvian fissure and large intracranial hematoma in the right parietal lobe. The CT angiography showed a saccular aneurysm in the peripheral cortical segment of the right angular branch of the right DMCA. We decided to perform a right craniotomy to evacuate hematoma and interrupt the aneurysm. Just after the dural incision, the aneurysm ruptured again. We applied a temporary clip on the artery proximal to the aneurysm before excising it. CONCLUSION: Aneurysm in DMCA can be treated safely with surgical excision and risk of sudden recurrent hemorrhage needs to be anticipated.

FLAIR vascular hyperintensity with DWI for regional collateral flow and tissue fate in recanalized acute middle cerebral artery occlusion.

PURPOSE: Fluid-attenuated inversion recovery (FLAIR) vascular hyperintensity (FVH) extent or FVH-DWI mismatch as a primary influencing factor of clinical outcome in acute ischemic stroke is controversial. This study elucidated the regional pathophysiology and tissue fate in four types of cortical territories classified by the initial FVH and DWI findings in patients with acute proximal middle cerebral artery (M1) occlusion successfully recanalized using mechanical thrombectomy. METHODS: We retrospectively evaluated 35 patients successfully recanalized within 24 h of acute M1 occlusion onset between 2016 and 2019. Each Alberta stroke program early CT score area of M1-M6 were categorized as group A (DWI-, FVH-), B (DWI-, FVH+), C (DWI+, FVH+), or D (DWI+, FVH-). Territorial collateral status was graded on a 4-point scale by initial angiogram. Follow-up head computed tomography (CT) findings on days 2-9 were assessed for the territorial outcome. RESULTS: Overall, 210 cortical territories were identified; of these, 88 (41.9 %) were categorized into group A; 72 (34.3 %), group B; 37 (17.6 %), group C; and 13 (6.2 %), group D. The rate of territories with good collaterals (grade 2 or 3) significantly decreased in the order of groups as 78.3 %, 62.7 %, 27.6 %, and 0%, respectively (Ptrend <.001). Conversely, the rate of territories with any hypo- or hyper-density on follow-up CT significantly increased in the order of groups as 13.4 %, 23.1 %, 88.5 %, and 85.7 %, respectively (Ptrend <.001). CONCLUSION: Categorization of cortical areas based on the FVH and DWI findings can stratify territorial collateral status and tissue fate.

Early treatment of progressive vertebral arteriovenous fistula caused by cervical penetrating injury.

BACKGROUND: Penetrating injury of the vertebral artery (VA) is uncommon because it lies deep in the neck and is surrounded by a bony foramen. Vertebral-venous fistula is a rare vascular condition in which there is direct aberrant communication among the extracranial vertebral artery, its radicular or muscular branches, and adjacent venous structures. CASE PRESENTATION: We report an asymptomatic patient of fistula from the vertebral artery to the paravertebral veins secondary to a cervical stab wound that increased in size and flow, as observed on the angiogram 10 days later, which was successfully treated by endovascular surgery. The postoperative angiogram showed improved visualization of the bilateral posterior cerebral arteries. CONCLUSION: Endovascular embolization at the early phase should be undertaken for traumatic high-flow vertebral-venous fistula, even if the patient is asymptomatic, to prevent progressive posterior circulation insufficiency due to the rapid growth of the fistula, which can ultimately lead to the steal phenomenon.