Katsunari Namba's research while affiliated with Jichi Medical University and other places

Publications (34)

Article
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Neurofibromatosis type 1 is an inherited disease. Vascular malformation represents minor complication but the rupture is fatal. We report two cases of ruptured vascular malformation in extracranial carotid artery who survived after successful treatment. Case 1 was a 35-year-old man who presented with airway obstruction due to a mass in the pharynx....
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Recent reports suggest that Staphylococcus haemolyticus can cause infective endocarditis (IE). However, no data are available regarding infectious intracranial aneurysm (IIA) following S. haemolyticus endocarditis. Endovascular coiling is a challenging approach for the treatment of IIA. We describe the case of a 63-year-old woman who suddenly devel...
Article
Intradural AVF below the conus medullaris may develop either on the filum terminale or the cauda equina (lumbosacral and coccygeal radicular nerves). Although not a few filum terminale AVFs are found in the literature, only 3 detailed cauda equina AVFs have been reported. Here, we analyze the angiographic and MR imaging findings of our cauda equina...
Article
Background: Inventing an optimal curve on a microcatheter is required for successful intracranial aneurysm coiling. Shaping microcatheters for vertebrobasilar artery aneurysm coiling is difficult because of the vessel's long, tortuous and mobile anatomy. To overcome this problem, we devised a new method of shaping the microcatheter by using the pa...
Article
Marfan syndrome is known to cause aneurysm and dissection of the aorta and cerebral artery. Although there are many reports of dissection of the aorta, there are few of intracranial artery dissection. We report a 32‐year‐old man with Marfan syndrome. He was presented to our hospital with sudden left hemiparesis and dysarthria. The initial diffusion...
Article
Objectives To develop an in vitro model for studying the biological effect of complex-flow stress on endothelial cells in three-dimensional (3D) patient-specific vascular geometry. Materials and methods A vessel replica was fabricated with polydimethylsiloxanes using 3D printing technology from vascular image data acquired by rotational angiograph...
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The primitive carotid-vertebrobasilar anastomoses are primitive embryonic cerebral vessels that temporarily provide arterial supply from the internal carotid artery to the longitudinal neural artery, the future vertebrobasilar artery in the hindbrain. Four types known are the trigeminal, otic, hypoglossal, and proatlantal intersegmental arteries. T...
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Patient-specific vascular replicas are essential to the simulation of endovascular treatment or for vascular research. The inside of silicone replica is required to be smooth for manipulating interventional devices without resistance. In this report, we demonstrate the fabrication of patient-specific silicone vessels with a low-cost desktop 3D prin...
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Hemophilia is an X-linked hemorrhagic disease due to coagulation factor VIII or IX deficiency with approximately 5–10% incidence of central nervous system bleeding. We present an intriguing case of a refractory subacute subdural hematoma (SDH) controlled with endovascular embolization in a hemophilic patient. A 5-year-old severe hemophilic A boy pr...
Article
The cauda equina is composed of the lumbosacral and the coccygeal nerve roots and the filum terminale. In the embryonic period, discrepancy in development between the termination of the spinal cord and the spinal column results in elongation of the nerve roots as well as the filum terminale in this region. Although the vascular anatomy of the cauda...
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We report a case of localized convexity hypertrophic pachymeningitis (HP) associated with aortitis. HP is considered to be one type of IgG4-related systemic disease as well as aortitis. A 38-year-old man with aortitis was admitted to our department due to generalized convulsive seizures. MRI revealed a localized mass like thickening of the convexit...
Article
Optimal microcatheter is necessary for successful coiling of an intracranial aneurysm. The optimal shape may be pre-determined before the endovascular surgery using a 3-dimensional (3D) printing rapid prototyping technology. We report a preliminary series of intracranial aneurysms treated with a microcatheter shape determined by the patient's anato...
Article
Stent-assisted coiling of paraclinoid aneurysms is widely performed in neurointerventional surgery. The most common adverse event related to this procedure is cerebral thromboembolism. However, reports on ocular thromboembolism are scarce. We report our experience with two patients who developed ocular thromboembolism following Enterprise stent-ass...
Article
The anatomy of the double ophthalmic artery was visualized using fused imaging. The images demonstrate the first angiographic visualization of the course of the vessel.
Article
ABSTRACT A percutaneous medial saphenous artery catheterization technique for swine femoral access is described. The medial saphenous artery is accessed with a 22-gauge catheter-over-needle assembly, followed by 4-Fr 10-cm sheath insertion using the Seldinger technique. The 4-Fr sheath is subsequently exchanged over a 0.035-inch guidewire for a 5-F...
Article
We read with great interest the article written by Alomari et al,[1][1] and agree with the authors that Klippel-Trenaunay syndrome is not associated with spinal cord AVM. However, in their discussion, in relationship to spinal cord AVM with Parkes Weber syndrome, they comment briefly that “Spinal
Article
The aim of this study was to develop a technically simple swine aneurysm-training model by inserting a silicone aneurysm circuit in the cervical vessels. A silicone aneurysm circuit was created by designing multiple aneurysms in size and configuration on a silicone vessel. Five swine underwent surgical implantation of this circuit in the cervical v...
Article
During endovascular revascularization of subacute and chronic occlusion of the cervical internal carotid artery (ICA) it may be difficult to penetrate the lesion. Selecting the appropriate “true lumen”, a remnant of what had been the arterial lumen, at the initial step may facilitate the procedure. Because plaque at the carotid bifurcation is known...
Article
【目的】治療困難な破裂内頚動脈瘤に対して部分塞栓術を行い,流速低下部位に一致した瘤内血栓化を認めた症例を報告する.【症例】軽症のくも膜下出血で来院した91歳女性.広頚かつ大型(22mm)の右内頚動脈瘤を認め,保存的に治療したが1ヵ月後に再出血した(WFNS GradeII).再出血当日の部分塞栓術直後は瘤全体が造影されたが,2週間後の血管撮影でブレブを含む動脈瘤先端部の血栓化を認めた.同部位は治療前の画像を元にコンピューターシミュレーションで可視化された流速低下部位に一致していた.【結論】塞栓術がdome fillingで終了した場合であっても,脳動脈瘤内の流速低下部位に血栓化が起こりやすいことが示唆された.
Article
Full-text available
The natural course of symptomatic carotid artery occlusion with hemodynamic impairment is poor. Surgical revascularization may improve the outcome; however, its efficacy has not been established yet. The goal of this study was to characterize the technical and clinical outcomes following endovascular recanalization of the ICA under cerebral circula...
Article
A successful neuroendovascular procedure depends on accurate anatomical understanding of a target vessel in relation to surrounding anatomical structures or endovascular devices, such as coils and stents. During an endovascular procedure, with conventional or three dimensional (3D) rotational angiography, this type of information is extremely diffi...
Article
To assess the feasibility and analyze angiographic and histological results of experimental aneurysms treated with an embolic-containing device (ECD) and to test a liquid embolic agent (LEA), N-butyl cyanoacrylate. Four experimental large bifurcation aneurysms and 1 large sidewall aneurysm were created in 5 dogs. These venous pouch aneurysms were o...
Article
Objective: To report efficacy of transarterial Onyx embolization of dural arteriovenous fistulas (DAVFs) previously treated with N-butyl cyanoacrylate (NBCA). Two cases are presented with special considerations given to the technical and anatomical aspects based on operative findings.Case Presentation: Superior petrosal and tentorial DAVFs presente...
Article
Objective: Extracranial carotid artery aneurysm is a rare vascular lesion compared to stenotic or occlusive lesions. A case of extracranial giant carotid artery aneurysm that progressively enlarged to cause the complication of severe brain ischemia is presented. Case presentation: A 73-year-old male presented to our hospital with hoarseness and a l...
Article
Objective and importance: Spinal arteriovenous metameric syndrome (SAMS) is a complex of vascular malformations involving the skin, paraspinal soft tissue, spine, and spinal cord in the same metamere. Treatment of this condition is often difficult due to the extent of the lesion. We report a case of successful palliative management of SAMS presenti...
Article
The optimal therapy for ophthalmic segment aneurysms with anterior optic pathway compression (AOPC) is undecided. Surgical results have been described, but the results of endovascular coil therapy have not been well documented. The authors retrospectively reviewed data obtained in all patients who harbored unruptured ophthalmic segment aneurysms wi...
Article
A hemostasis valve is routinely used in neuroendovascular procedures to decrease the risk of thromboembolism 1,2 . Recently, a new hemostasis valve that is designed to minimize blood loss has been introduced. We report our initial experience in using this new hemostasis valve. In neuroendovascular procedures, a hemostasis valve is commonly used for...
Article
The authors report their experience using HydroCoils in the treatment of cerebral aneurysms. We performed a retrospective review of the first 100 nonrandomized patients (104 coiled saccular cerebral aneurysms) treated with HydroCoils during a 27-month period. The average percentage of HydroCoil by length detached in treated aneurysms was 45.5% (ran...
Article
The authors present 3 patients who underwent neuroendovascular procedures in which DynaCT produced by a flat-panel detector facilitated management of complications. As part of a combined CT/angiography suite, DynaCT offered the major advantage of immediate detection or exclusion of intracranial complication without patient transfer. The quality of...

Citations

... Only a few reports are available about infected aneurysms forming shortly after septic embolism. [6,15] In this case, no aneurysm was found during thrombectomy, but small hemorrhage appeared around the infarct area of the ACA territory on head CT obtained 24 h after thrombectomy [ Figure 2b], indicating that the process of aneurysm formation and rupture can occur shortly after septic embolism. When an infected aneurysm results in intracerebral hemorrhage instead of subarachnoid hemorrhage, there is a risk of misdiagnosing it as hemorrhagic infarction. ...
... [14] Cauda equina AVFs fed by the proximal radicular arteries are extremely rare. [13,17,22] SDAVFs are the most common type of spinal vascular malformations. [21] SDAVFs in the sacral region are rare and usually misdiagnosed. ...
... Many types of microcatheters are used for the endovascular treatment of intracranial aneurysms, with no consensus about the ideal shape of a microcatheter for different procedures. [1][2][3][4] Compared with conventional microcatheters with a fixed shape, steerable microcatheters can bend or articulate, allowing fuller control over the placement of endovascular devices. [5][6][7][8][9][10][11][12] The Bendit steerable and bendable microcatheter (Bendit Technologies, Ltd., Petach Tikva, Israel) received Food and Drug Administration (FDA) clearance in 2019. ...
... For example, tubular tissue scaffolds where the inner wall is seeded with endothelial cells have been used to compare the endothelial damage caused by aspiration catheters and stentretrievers (SR) (23). Similarly, attempts have been made to grow endothelial cells on the luminal surface by coating the surface with fibronectin (24). Silicone aneurysm tubes have been successfully endothelialized for in-vitro evaluation of flow divertors (25). ...
... www.nature.com/scientificreports/ VA is the longitudinal anastomosis of segmental meristem artery 17 . The bilateral VAs usually develop from the distal end of the seventh intersegmental dorsal arteries. ...
... Some investigators have used a liquid silicone rubber coating to mimic the lubricity of the endothelial layer and to reduce the friction on the inner wall of the vessel (14). Kaneko et al. applied ABS solvent to smooth the surface of the model and showed a reduction in the force required to navigate a microwire through the vessel (18). Others have infused the models with slippery fluid and surfactants resulting in similar device navigation compared with patients (15,19,20). ...
... The filum terminale (FT) is a fibrous band extending from the conus medullaris to the periosteum of the coccyx and includes the intradural components of the FT interna (FTI) and extradural sacrococcygeal components of the FT externa (FTE). [1][2][3][4] Although spinal arteriovenous fistulas (AVFs) occasionally develop at the FT resulting from an abnormal connection between the artery and vein of the FT, FT arteriovenous fistulas (FTAVFs) are extremely rare spinal AVFs, accounting for approximately 3% of all spinal AVFs. 5 FTAVF presents as progressive myelopathy and conus medullaris syndrome caused by spinal cord venous congestion. 3,6 Most reported FTAVFs are intradural spinal AVFs that developed in the FTI and present with perimedullary drainage. ...
... With the advancement of 3D-print techniques, the medical simulation model is becoming an important modality in neurosurgical training. In the field of neurovascular diseases, 3D-print medical simulators have been applied for the informed consent of neurovascular surgery [8], the teaching course for skull base anatomy and skull base surgery simulation [9], and the preoperative simulation of aneurysm microsurgery [10][11][12][13][14]. Recently, a patient-specific neurovascular simulator with hollow channels has been fabricated for the training [15], preoperative simulation [16][17][18][19][20] of neurovascular intervention, and fluid dynamic analysis [21][22][23]. As compared with the traditional training methods Figure 1. ...
... Koil embolizasyon sonrası ilerleyici görsel fonksiyon bozukluğu literatürde nadir olarak vaka sunumları şeklinde bildirilmiş olup, serebral veya oküler tromboembolitik olaylara ve sonrasında gelişebilecek retina veya optik sinir iskemisine, geçici inflamatuar olaylara ya da tedavinin tam başarılı olamaması sonucu anevrizmanın genişlemesine bağlanmıştır. [18][19][20] Hastamızın mevcut görsel bulgularının ilerleyici olarak kötüleşmesi ve özellikle görme alanı de-fektinin İKA anevrizması ya da koil embolizasyon ile çok da uyumlu olmaması nedeniyle, anevrizmanın ko-insidental olarak saptanmış olabileceği düşünülerek daha küçük bir lezyonu ortaya çıkarmak amacıyla hastadan üçüncü defa ince kesit yağ baskılı yüzeyel-koil kranio-orbital MR istendi. Son MR görüntülemesinde sağ optik sinir kılıfı menenjiyomu tespit edilmesi üzerine 2011 senesinde çekilen MR görüntüleri tekrar incelendiğinde ilk MR görüntülerinde de optik sinir kalınlaşmasının bulunduğu, bunun optik disk ödemine bağlı olduğu düşünüldüğü için hastanın kontrastlı MR görüntülemesinin yapılmadığı saptandı. ...
... Double origin from the internal carotid artery (Fig. 2a) The double origin of the OA is a very rare variant, its incidence is estimated to be around 0.2% [25], and only few cases are reported in the literature [16,25,32,[37][38][39][40][41][42]. The first case was described by Lasjaunias [16] who explained this anatomical variation by the lack of anastomotic ring around the optic nerve between the PDOA and the PVOA. ...