Inadvertent Detachment of Stent Retrievers: Report of 2 Cases.

Mechanical thrombectomy using a stent retriever is a widely-used technique for recanalizing occluded cerebral arteries in acute ischemic stroke. Although rare, inadvertent stent detachment has primarily been reported with earlier stent retriever designs. We present 2 cases of inadvertent stent detachment with the pRESET stent.

Improving the Prognosis of Patients With Acute Ischemic Stroke Treated in the Late Time Window After the Introduction of Advanced Imaging Software: Benefits From Thrombectomy in the Extended Time Window.

Background: Mechanical thrombectomy (MT) of ischemic stroke was recommended as a clinical guideline in 2015, and the indication for time was expanded in 2018 based on two clinical studies. We aimed to compare and analyze the prognosis of patients treated under the extended time indication before and after the introduction of advanced software.

Methods: We obtained data from medical records between 2016 to 2020.

Sudden sensorineural hearing loss with intralabyrinthine hemorrhage after COVID-19 vaccination.

Otologic symptoms of sudden sensorineural hearing loss (SSNHL) have been reported after Coronavirus disease 2019 (COVID-19) vaccinations. However, the association between SSNHL and COVID-19 vaccination has not been clearly established. SSNHL with vertigo can be induced by intralabyrinthine hemorrhage (ILH).

A deep learning algorithm may automate intracranial aneurysm detection on MR angiography with high diagnostic performance.

Objectives: To develop a deep learning algorithm for automated detection and localization of intracranial aneurysms on time-of-flight MR angiography and evaluate its diagnostic performance.

Methods: In a retrospective and multicenter study, MR images with aneurysms based on radiological reports were extracted. The examinations were randomly divided into two data sets: training set of 468 examinations and internal test set of 120 examinations.

Dual microcatheter coil embolization of acutely ruptured wide-necked intracranial aneurysms.

The dual microcatheter technique is an alternative treatment for stent-assisted coiling in acutely ruptured wide-necked aneurysms because of no antiplatelet therapy. We assessed the safety and efficacy of this technique in ruptured wide-necked aneurysms. Between March 2008 and March 2016, 56 acutely ruptured aneurysms were treated with the dual microcatheter technique.

Solitary Fibrous Tumor of Central Nervous System: A Case Report.

Solitary fibrous tumor (SFT) is a rare neoplasm of mesenchymal origin, especially in the central nervous system (CNS). Reported herein is a case of SFT of CNS in a 63-year-old female patient who had confused mentality, without other neurological deficit. The brain MRI showed an ovoid mass in the right frontal lobe.

The olfactory groove schwannoma attached to the cribriform plate: a case report.

The olfactory groove schwannoma is a quite rare tumor. We report a case of a 49-year-old woman with an olfactory groove schwannoma attached to the cribriform plate without olfactory dysfunction. She had no specific neurological symptoms other than a headache, and resection of the tumor showed it to be a schwannoma.

Transvenous Embolization of Cavernous and Paracavernous Dural Arteriovenous Fistula through the Facial Vein: Report of 12 Cases.

Purpose: The aim of this study was to evaluate the feasibility and safety of the transfacial venous embolization of cavernous or paracavernous dural arteriovenous fistula (DAVF) in which approach via inferior petrosal sinus (IPS) was not feasible.

Materials And Methods: We identified the cases of transfacial venous embolization of cavernous sinus (CS) or adjacent dural sinuses from the neurointerventional database of three hospitals. The causes and clinical and angiographic outcomes of transfacial venous embolization were retrospectively evaluated.

Rescue microsurgery in coil herniation causing thromboembolic occlusion of parent artery.

Background: Malpositioned coils can provoke abrupt occlusion of the parent vessels and/or neighboring branches causing stroke during coil embolization (CE) of intracranial aneurysms. The authors describe a series of cases in which urgent surgical recanalization of the vessels clogged with herniated or migrated coils rescued the patients.

Methods: A total of six patients with aneurysms who underwent surgical management for parent artery occlusion linked with inadvertent coil herniation were selected.

Blister-like aneurysms of the supraclinoid internal carotid artery: challenging endovascular treatment with stent-assisted coiling.

''Blister-like'' aneurysms of the supraclinoid segment of the internal carotid artery are usually small and have fragile walls, necessitating special care to prevent rebleeding. These lesions are considered high-risk aneurysms because of the technical difficulties associated with their surgical and endovascular treatment. In this report, we describe the use of stent-assisted, repeated coil embolization in the treatment of a ruptured blister-like aneurysm that experienced rapid growth.

Endovascular thrombolysis and stenting of a middle cerebral artery occlusion beyond 6 hours post-attack: special reference to the usefulness of diffusion-perfusion MRI.

Intra-arterial thrombolysis and percutaneous angioplasty is feasible in patients with acute middle cerebral artery (MCA) occlusion limited to 6 hours post-ictus, but there are some limitations such as reocclusion or hemorrhagic complications. In this report, we describe a stent placement in the treatment of a refractory artherothrombotic MCA occlusion beyond 6 hours of symptom onset. A 57-year-old man presented with a progressive left-sided weakness and verbal disturbance resulting from an acute thrombotic occlusion of the right MCA superimposed on severe proximal atheromatous stenosis.

Posttraumatic infarction in the territory supplied by the lateral lenticulostriate artery after minor head injury.

Background: Occlusion of the intracranial arteries due to blunt head traumas has been less frequently observed in patients with minor head injuries.

Case Report: A 4-year-old boy presented with speech disturbance 2 h after minor head injury. An initial computed tomography (CT) scan showed a questionable finding of a focal punctate high density in the left basal ganglia.

Traumatic dissection of the internal maxillary artery associated with isolated glossopharyngeal nerve palsy: case report.

Objective And Importance: Spontaneous or traumatic dissection of the internal carotid artery with resultant lower cranial nerve palsies is well documented. However, dissection of the external carotid artery with lower cranial palsies has not been reported previously.

Clinical Presentation: A 42-year-old man experienced an epidural hematoma as the result of a fall and underwent a craniotomy and hematoma removal.

Treatment of intra- and extracranial arterial dissections using stents and embolization.

Purpose: To evaluate the safety and efficacy of stent placement for extracranial and intracranial arterial dissections.

Methods: Eighteen patients underwent endovascular treatment of carotid and vertebral dissections using intraluminal stent placement. Five patients with arterial dissection were treated, 2 using one insertion of a single stent and 3 using placement of two stents.

Therapeutic endovascular treatments for traumatic carotid artery injuries.

Objective: The diagnosis and management of traumatic carotid vessel injuries continue to be controversial, with direct surgical repair with parent artery preservation still presenting difficulties. The purpose of this report is to review the endovascular therapy of patients with traumatic carotid vessel injuries for preservation of the parent artery, and to determine the safety and efficacy of endovascular therapy.

Methods: Ten patients with traumatic carotid lesions were treated using therapeutic endovascular methods.

Parapharyngeal branchial cleft cyst extending to the skull base: a lateral transzygomatic-transtemporal approach to the parapharyngeal space.

Second branchial cleft cysts (BCCs) can occur anywhere from the tonsillar fossa to the supraclavicular area. Second BCCs usually lie on the great vessels of the neck, deep in the sternocleoidomastoid muscle or along its anterior border at the mandibular angle. Parapharyngeal second BCCs are an uncommon neoplasm and rarely extend to the skull base.

Significance of 99mTc-ECD SPECT in acute and subacute ischemic stroke: comparison with MR images including diffusion and perfusion weighted images.

99mTc-ECD SPECT is valuable for the evaluation of cell viability and function. The purpose of the present study was to evaluate the significance of 99mTc-ECD brain SPECT in ischemic stroke. We compared 99mTc-ECD brain SPECT with perfusion and diffusion weighted images (PWI, DWI).

Emergency endovascular treatment of internal carotid artery injury during a transsphenoidal approach for a pituitary tumor --case report--.

Carotid artery injury is a very rare, but life threatening complication that can occur during a transsphenoidal approach. We experienced one case of carotid artery injury during a transsphenoidal pituitary tumor surgery. The patient was immediately treated by a balloon occlusion and complete packing of the cavernous carotid artery using Guglielmi detachable coils (GDCs) and the rest of the tumor was removed after the carotid occlusion.