Language：Japanese   Publisher：一般社団法人 日本内分泌学会  

DOI： 10.1507/endocrine.101.s.hpt_75

CiNii Research

Language：English   Publisher：World Neurosurgery  

Surgical interventions for arachnoid cysts and glioependymal cysts primarily focus on cyst decompression and establishing communication with cerebrospinal fluid spaces. However, a standardized surgical strategy for symptomatic convexity cysts lacking surrounding cerebrospinal fluid space is still lacking due to the limited number of cases. This systematic review aims to evaluate surgical interventions for symptomatic convexity cysts and proposes a safe and effective treatment approach we have developed. A systematic review of the literature was conducted following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Surgical techniques were categorized into cystoperitoneal shunt, cyst excision, cyst fenestration, cyst ventriculostomy, and several uniquely modified methods. Using a method different from these previous reports, we performed endoscopic cystoventricular stenting via burr hole in 3 cases of convexity cysts. While traditional methods have proven effective, cystoperitoneal shunt may lead to malfunction, infection, and subdural hematoma; wall excision is invasive and increases morbidity risks. Fenestration and cystoventriculostomy have also reported cases of recurrence. Other methods also pose issues, including off-label use of instruments and inadequate consideration for removal. The method we performed for placing the stent catheter with multiple side holes demonstrated long-term effectiveness. Furthermore, the surgery was conducted with the patient fully awake, and the use of electrical stimulation mapping enabled preservation of higher neurocognitive functions, including language, working memory, and spatial cognition, at the puncture site. This novel approach offers advantages such as minimally invasive procedure, preservation of safe brain function, and long-term patency. Further studies are warranted to validate these findings and improve surgical strategies for convexity cysts.

DOI： 10.1016/j.wneu.2024.10.031

Open Access

Web of Science

Scopus

PubMed

Publisher：Journal of Physics Conference Series  

YBCO superconductors offer high transition temperatures for applications. REBCO wires, made via pulsed laser deposition (PLD), are developed for various uses. However, optimizing PLD parameters is time-consuming. To resolve this, we aimed to develop the simulation of REBCO thin film growth with Monte Carlo algorithm and Bayesian optimization to find the optimal parameters. While current simulations show discrepancies with experiments, this approach sets the foundation for improved models and simulations.

DOI： 10.1088/1742-6596/3054/1/012020

Open Access

Scopus

Language：English  

DOI： 10.2196/80678

Web of Science

PubMed

Language：Japanese   Publisher：The Japanese Society on Surgery for Cerebral Stroke  

<p>The use of endoscopy in the treatment of brainstem cavernous malformations (BCMs) has been reported in a limited number of cases. Given its ability to provide a broad and bright field of view even in deep regions, endoscopy is considered effective for treating deep-seated lesions, such as BCMs, and has been actively utilized in our institute.</p><p>This study retrospectively reviewed 32 cases of BCMs treated with endoscopic techniques (midbrain, 7 cases; pons, 22 cases; and medulla, 3 cases). The approach routes to the brainstem were based on the “Two Point Method,” primarily utilizing the nearby safe entry zones. Surgical removal was performed through transnasal procedures in 5 cases and craniotomy in 27 cases, with 25 of these employing small diameter cylinders to secure the surgical corridor. Gross total resection was achieved in 30 cases (93.8%). Postoperative complications were observed in five cases. The average Karnofsky Performance Status improved from 62.2 preoperatively to 84.4 3 months postoperatively, with improvements in 26 cases, no change in 5 cases, and deterioration in 1 case. Surgical treatments for BCMs are predominantly performed under a microscope; however, the outcomes of endoscopic surgery in this study showed favorable neurological prognoses compared with the findings of previous reports. The use of endoscopy facilitated the minimization of surgical pathways and enabled underwater surgery, thereby establishing a novel approach that is not preferably available in microscopic surgery. Underwater intraoperative observation, a distinctive feature of endoscopic surgery, was highly effective in identifying residual lesions and achieving hemostasis. Despite its advantages, endoscopy presents challenges, prompting ongoing developments and improvements in surgical instruments and techniques. Although this technique is still evolving, the utility of endoscopy for treating BCMs is promising.</p>

DOI： 10.2335/scs.53.108

CiNii Research

Language：English   Publisher：The Japan Neurosurgical Society  

<p>Craniopharyngioma (CP) and Rathke's cleft cyst (RCC) are both suprasellar lesions. They are sometimes difficult to distinguish due to their similar findings. We report a case of papillary craniopharyngioma (pCP) with the clinical findings suggesting RCC. A 42-year-old female with intellectual disability presented to our hospital with severe visual dysfunction. Preoperative images revealed a suprasellar cystic lesion without calcification. We performed transsphenoidal surgery. Since the cyst had condensed-milk-like content suggesting RCC, we performed cyst fenestration and wash without removal of the cyst wall. Thereafter, we found fish-egg-like structures on the cyst wall. The histopathological analysis revealed that they had papillary structures surrounded by hyperplastic squamous epithelium with parakeratosis. Immunostaining for BRAF V600E was positive, leading to the diagnosis of pCP. After the surgery, her visual function improved and follow-up Magnetic resonance imaging at 18 months postoperatively showed no apparent recurrence. The presence of condensed-milk-like content suggests a likelihood of RCC indicating that aggressive resection may not be necessary. In contrast, the existence of fish-egg-like structures suggests pCP and requires careful follow-up.</p>

DOI： 10.2176/jns-nmc.2024-0057

Open Access

PubMed

CiNii Research

Language：English   Publisher：Child S Nervous System  

Background: Periventricular pediatric low-grade gliomas (pLGG) present a surgical challenge due to their deep-seated location, accessibility, and relationship with the subcortical network connections. Minimally invasive parafascicular approaches with tubular brain retractors (port brain surgery) have emerged, in recent years, as an alternative to conventional microsurgical and endoscopic approaches for removal of periventricular tumors. Objectives: To describe the minimally invasive approach with tubular brain retractors for periventricular pLGG, its technique, applications, safety, and efficacy. Methods: In this article, we describe the port brain surgery techniques for periventricular pLGG as performed in different centers, with different commercialized tubular retractor systems. Illustrative cases followed by a literature review are analyzed, with a detailed description of different approaches or techniques, comparing their advantages and disadvantages with contemporary microsurgical and endoscopic approaches. Conclusions: The port brain surgery with micro-exoscopic vision and endoscopic assistance, for the treatment of deep-seated lesions such as periventricular pLGG, is an alternative for achieving a functionally safe—gross total or subtotal—tumor resection, obtaining adequate tissue for pathological examination. This technique could offer a new dimension for a less-invasive, safe, and effective access to deep-seated tumors, offering the possibility to lower morbidity in experienced hands.

DOI： 10.1007/s00381-024-06417-5

Web of Science

Scopus

PubMed

DOI： 10.1016/j.wneu.2018.11.017

DOI： 10.18999/nagjms.76.1-2.73

Open Access

DOI： 10.1007/s00701-012-1473-3