Long-term follow-up showed that EVT, especially tVE, is an efficient and safe treatment for CS-dAVF. It resulted in the eventual disappearance of shunt flow. Residual shunt without major retrograde flow or cortical venous reflux can be monitored without additional treatment.

Aneurysms located at the distal portion of the anterior inferior cerebellar artery (AICA) are rare, and their clinical features are not fully understood. We report the clinical features and management of nine distal AICA aneurysms in nine patients treated during the past decade at Kagoshima University Hospital and affiliated hospitals. Our series includes seven women and two men. Of their nine aneurysms, eight were ruptured and one was unruptured; six were saccular and three were dissecting aneurysms. The most prevalent location was the meatal loop (n = 5) followed by the postmeatal (n = 3) and premeatal segment (n = 1) of the AICA, suggesting hemodynamic stress as an etiology of these distal AICA aneurysms. Of the nine patients, five presented with angiographic features suggestive of increased hemodynamic stress to the AICA and the common trunk of the posterior inferior cerebellar artery, with vertebral artery stenosis, marked laterality, and a primitive hypoglossal artery. We addressed eight aneurysms (eight patients) surgically; one aneurysm in one patient disappeared in the course of 3 months without surgical treatment. Of the eight surgically treated aneurysms, seven were ruptured and one was unruptured, five were clipped via lateral suboccipital craniotomy, two were trapped via lateral suboccipital craniotomy, and one was embolized. Good outcomes were obtained in six of the eight patients who underwent operation (75 %). We consider increased hemodynamic stress attributable to anatomic variations in the AICA and related posterior circulation to be the predominant contributor to the development of distal AICA aneurysms. Direct clipping and trapping yielded favorable outcomes in our series.

In patients with severe arteriosclerosis or anatomical variations such as a bovine arch, the insertion of a guiding catheter for carotid artery stenting is difficult. The authors use a guide wire system as an anchor and advance the guiding catheter to an area proximal to the stenotic structure. This method is useful and safer than others for carotid artery stenting.

We report a patient with acute-phase cerebral embolism related to Trousseau's syndrome (TS) in whom thrombectomy was performed, and white thrombi were captured. Case Presentation: The patient was a 65-year-old female. Sudden-onset dizziness and progressive consciousness disorder were noted. Diagnostic imaging led to a diagnosis of occlusion of the basilar artery (BA). In the acute phase, thrombectomy was performed, and white thrombi were captured, differing from standard-type embolism. After surgery, the symptoms rapidly reduced, but systemic investigation suggested advanced gastric cancer as an etiologic factor for embolism. Subsequently, embolism recurred, and the patient died of hemorrhagic cerebral infarction 31 days after onset. Conclusion: If a white thrombus is captured during thrombectomy, TS should be differentiated as an etiologic factor.

Deep Sylvian meningiomas are rare, accounting for 0.3–0.4% of all meningiomas, and mostly present in young adults and children. We report on a 32-year-old man who presented with headache but had no neurological deficits. Computed tomography of brain revealed a 24 × 19 × 21 mm 3 mass lesion in the right Sylvian fissure with calcification. Magnetic resonance imaging showed that the lesion was isointense on T 1 - and T 2 -weighted images (WI), with homogenous enhancement on post-gadolinium T 1 WI. The lesion was surgically removed via right fronto-temporal craniotomy. The tumor was located in deep Sylvian fissure and had no dural attachment. Histopathological examination of the lesion revealed both meningothelial and fibroblastic features, thereby suggesting the diagnosis of transitional meningioma (WHO grade I), with Ki-67 labeling index of 6.9%. Thus, meningioma should be considered as a differential diagnosis of enhancing mass lesions in the Sylvian fissure even in the absence of dural tail sign, especially in young adults and children.

A 7-year-old boy presented with acute onset of left hemiparesis and headache, followed by disturbance of consciousness. Neuroimaging studies showed pontine hemorrhage. Surgery was performed to remove a massive hematoma. Histological examination of the wall revealed anaplastic astrocytoma. Postoperative radiation therapy and several types of chemotherapy were administered. However, the tumor recurred and he died 9 months after onset. Hemorrhagic onset of pontine glioma is rare and carries an extremely poor prognosis.

Among middle cerebral artery aneurysms, those at the M1 portion of the middle cerebral artery have a lower incidence of occurrence. We retrospectively analyzed and reported the clinical features and management of 12 M1 aneurysms in 12 patients treated with direct clipping. Aneurysms arising at the M1 portion were mostly smaller in size and prevalent in older women, on the left side, with more intracerebral hematoma and less accompanied than those at the bifurcation. Ruptured aneurysms comprised 80% of the aneurysms and were larger than 5 mm in size, while 14.3% of those smaller than 5 mm in size were unruptured. Aneurysms were located in the upper (n=5), downward (n=5), anterior (n=1), and posterior (n=1) directions. Of the five aneurysms in the upper direction, three were in the early frontal branch, one was in the early temporal branch, and one was in the lenticulostriate artery. Two of the aneurysms in the upper direction had an intracerebral hematoma (ICH) in the frontal and temporal lobes, while one aneurysm in the downward direction had an ICH in the temporal lobe. The preoperative clinical grade of M1 aneurysms with ICH was worse than that of bifurcation aneurysms; however, the outcome was equal to that of bifurcation aneurysms.Aneurysms arising at the M1 portion should be treated with a preoperative meticulous investigation for their anatomical complexity, not only with direct clipping but also with endovascular techniques.

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