Full-Endoscopic Surgery for Hypothalamic Hamartoma Resection.

Hypothalamic hamartomas (HH) are rare developmental anomalies of the inferior hypothalamus that often cause refractory epilepsy, including gelastic seizures. Surgical resection is an effective method to treat drug-resistant epilepsy and endocrinopathy in a suitable patient group. Open surgery, endoscopic surgery, ablative procedures, and stereotactic radiosurgery can be utilized. In this study, we aimed to describe the full-endoscopic approach for HH resection. The technique involves the use of an intraoperative ultrasonography (USG) system, a 30° rigid endoscope system that has an outside diameter of 2.7 mm with two working channels, a stylet that has an outer diameter of 3.8 mm, a monopolar coagulation electrode, a fiberoptic light guide, and the endovision system. Microforceps and monopolar electrocautery are the two main surgical instruments for HH removal. The protocol is easy to apply after a particular learning curve has been passed and shorter than open surgical approaches. It leads to less blood loss. Full-endoscopic surgery for HH is a minimally invasive technique that can be applied safely and effectively with good seizure and endocrinological outcomes. It provides low surgical site pain and early mobilization.

The Effect of Halofuginone Use on Epidural Fibrosis After Spinal Surgery: An Animal Experiment.

AIM: To investigate the effectiveness of local halofuginone application for spinal epidural fibrosis (EF) after lumbar laminectomy in rats. MATERIAL AND METHODS: Forty rats were equally divided into four groups (Groups I-IV; 10 rats in each group), and lumbar laminectomy was performed under general anesthesia. After laminectomy, Group I received saline (NaCl 0.9%) locally (control), Group II received spongostan, Group III received 0.5 mL of halofuginone-impregnated spongostan, and Group IV received 0.5 mL of halofuginone. Spongostan was used to prolong the exposure period of halofuginone. All rats were sacrificed after four weeks and evaluated according to histopathological criteria. A p-value of < 0.05 was considered statistically significant. RESULTS: Fibrosis was significantly lower in Group IV than in Group I (p < 0.05). There was no significant difference in fibrosis between Group II/III and Group I. It was observed that spongostan increased fibrosis. CONCLUSION: Halofuginone helps prevent EF after spinal surgery. However, further clinical and experimental studies are needed to assess its safety in humans.

Full-Endoscopic Technique for Posterior Fossa Decompression in Chiari Malformation.

BACKGROUND AND IMPORTANCE: Full-endoscopic techniques are well-described for spinal procedures. Although endoscopic-assisted techniques are reported for posterior fossa decompression (PFD) in Chiari malformation (CM), a full-endoscopic technique is yet to be reported in these patients. The aim of this study was to present and describe a full-endoscopic technique for PFD in patients with CM. CLINICAL PRESENTATION: Two patients diagnosed with CM were operated on by the full-endoscopic PFD technique. The patients consented to the procedure and to the publication of their image. An endoscope with an oval shaft cross-section with a diameter of 9.3 mm, a working length of 177 mm, a viewing angle of 20°, and a working channel of 5.6 diameters were used. Operative videos were recorded. The surgical steps were easily applied after the clear anatomic landmarks, such as the C1 posterior tubercle and the rectus capitis posterior minor muscles. The patients were followed up for 6 months. Both patients were symptom-free with a significant decrease in Visual Analog Scale score and a good functional outcome assessed by Chicago Chiari Outcome Scale after surgery without any complications. CONCLUSION: All the steps of the full-endoscopic technique for PFD described by the authors in their previous human cadaveric study were also feasible on patients with CM.

Full-Endoscopic Transforaminal Approach for Lumbar Discectomy.

With technical advancements, the full-endoscopic transforaminal approach for lumbar discectomy (ETALD) is gaining popularity. This technique utilizes various tools and instruments, including a dilator, a beveled working sleeve, and an endoscope with a 20-degree angle and 177 mm length, equipped with a 9.3-diameter oval shaft and a 5.6 mm diameter working channel. Additionally, the procedure involves using a Kerrison punch (5.5 mm), rongeur (3-4 mm), punch (5.4 mm), tip control radioablator applying a radiofrequency current of 4 MHz, fluid control irrigation and suction pump device, 5.5 mm oval burr with lateral protection, burr round, and the diamond round. During the surgery, it is essential to identify significant landmarks, including the caudal pedicle, ascending facet, annulus fibrosis, posterior longitudinal ligament, and the exiting nerve root. The steps of the technique are relatively easy to follow, especially when utilizing the appropriate instruments and having a good understanding of the anatomy. Research studies have demonstrated comparable outcomes to open microdiscectomy techniques. ETALD presents itself as a safe option for lumbar discectomy, as it minimizes tissue disruption, results in low postoperative surgical site pain, and allows for early mobilization.

Corrigendum: Full-endoscopic removal of third ventricular colloid cysts: technique, results, and limitations.

[This corrects the article DOI: 10.3389/FSURG.2023.1174144.].

Full-endoscopic removal of third ventricular colloid cysts: technique, results, and limitations.

Introduction: Colloid cysts (CCs) are rare benign lesions that usually arise from the roof of the third ventricle. They may present with obstructive hydrocephalus and cause sudden death. Treatment options include ventriculoperitoneal shunting, cyst aspiration, and cyst resection microscopically or endoscopically. This study aims to report and discuss the full-endoscopic technique for removing colloid cysts. Materials and methods: A 25°-angled neuroendoscope with an internal working channel diameter of 3.1 mm and a length of 122 mm is used. The authors described the technique of resecting a colloid cyst by a full-endoscopic procedure and evaluated the surgical, clinical, and radiological results. Results: Twenty-one consecutive patients underwent an operation with a transfrontal full-endoscopic approach. The swiveling technique (grasping the cyst wall and rotational movements) was used for CC resection. Of these patients, 11 were female, and ten were male (mean age, 41 years). The most frequent initial symptom was a headache. The mean cyst diameter was 13.9 mm. Thirteen patients had hydrocephalus at admission, and one needed shunting after cyst resection. Seventeen patients (81%) underwent total resection; 3 (14%), subtotal resection; and 1 (5%), partial resection. There was no mortality; one patient had permanent hemiplegia, and one had meningitis. The mean follow-up period was 14 months. Conclusion: Even though microscopic resection of cysts has been widely used as a gold standard, successful endoscopic removal has been described recently with lower complication rates. Applying angled endoscopy with different techniques is essential for total resection. Our study is the first case series to show the outcomes of the swiveling technique with low recurrence and complication rates.

Full Endoscopic Interlaminar Approach for Paracentral L5-S1 Disc Herniation.

The full endoscopic interlaminar approach (FEILA) is a minimally invasive technique for lumbar discectomy. It has multiple advantages over other conventional discectomy methods, including less traumatization of the soft tissues, fewer complication rates (dural injury, bleeding), rapid rehabilitation, quick return to daily life activities, and preferable cosmetic results. FEILA is a surgery with a relatively steep learning adaptation. Endoscopic surgery is a closed tubular approach, and all surgical maneuvers are performed within a uniportal single working channel. Also, the technique has not yet been standardized and well-documented. Therefore, the early learning stages of this technique may not be easy for most surgeons. Despite these, FEILA is easy, and the operation length is comparable to and even shorter than other techniques of lumbar discectomy. FEILA for lumbar discectomy could be considered a safe and effective alternative procedure for paracentral L5-S1 disc herniation. Here, we describe the technique of FEILA, including every cutoff step required to reach technical proficiency for surgeons who want to start applying this approach.

First case of Rhinocladiella mackenziei brain abscess in Turkey: Case report and review of the literature.

Rhinocladiella mackenziei is a highly neurotropic fungus, mainly reported from the Middle East. However, in recent years, there have been some cases from outside this region. We described an additional fatal case of R. mackenziei cerebral infection for the first time from Turkey and made a literature review of all previously reported cases. During 34 years (1988-2022), there have been 42 R. mackenziei brain abscess cases. Most patients have been reported from Saudi Arabia (n = 14, 33.3%). It is noteworthy that 40.5% of patients, including our case, were immunocompetent at initial diagnosis and mostly presented with a single lesion (n = 10, 23.8%). The most frequent comorbidities were solid organ transplant (n = 9, 21.4%), diabetes mellitus (n = 6, 14.3%), malignancy (n = 6, 14.3%) and prior surgery (n = 3, 7.1%). The most commonly used initial antifungal regimen were amphotericin B together with itraconazole (n = 9, 21.4%), combinations of lipid preparations of amphotericin B, voriconazole and/or posaconazole (n = 9, 21.4%) and amphotericin B alone (n = 8, 19%). Although both surgical procedures and antifungal medication in the majority of patients were performed, mortality rates remained high (90.4%). The area at risk of R. mackenziei cerebral abscess cases extends to other countries. Clinicians should be aware of this emerging disease and take a detailed travel history in patients with atypical and undocumented brain abscesses. Our case confirms the hypothesis that this fungus might spread more widely than previously predicted regions.

Full-Endoscopic Interlaminar Approach for Decompression of Lateral Recess Stenosis.

For lateral recess stenosis, extensive decompression with laminectomy is still performed in most centers. However, tissue-sparing surgeries are becoming more common. Full-endoscopic spinal surgeries have the advantages of being less invasive and offering a shorter recovery time. Here, we describe the technique of the full-endoscopic interlaminar approach for the decompression of lateral recess stenosis. The full-endoscopic interlaminar approach for the lateral recess stenosis procedure took approximately 51 min (range of 39-66 min). Blood loss could not be measured due to continuous irrigation. However, no drainage was required. There were no dura mater injuries reported in our institution. Furthermore, there were no injuries to the nerves, no cauda equine syndrome, and no hematoma formation. The patients were mobilized on the same day as surgery and discharged the next day. Therefore, the full-endoscopic technique for lateral recess stenosis decompression is a feasible procedure that lowers the operational time, complications, traumatization, and rehabilitation duration.

Pediatric Cerebral Cavernous Malformation: A Single-Centered Experience of 23 Cases.

AIM: To describe, and to evaluate the clinical and radiological characteristics of pediatric cavernous malformations (CMs) and the surgical approaches and their outcomes in a single center. MATERIAL AND METHODS: We retrospectively reviewed pediatric patients with CMs that were treated in our center between 2010 and 2020. Radiological, clinical, and demographic features, as well as treatment details were evaluated. RESULTS: Of 23 patients, 12 were male, and 11 were female. Two patients with multiple CMs had a family history. The most common symptoms were headaches (9/23, 39.1%) and seizures (9/23, 39.1%). Twenty patients had single lesions and three patients had multiple lesions. According to Zabramski classification, eight (34.7%) patients had type 1, 11 (47.8%) had type 2 and four (17.3%) had type 3 lesions. Thirteen patients had recurrent preoperative hemorrhages and nine had increased lesion size. Seven patients (30.4%) had coexisting deep venous anomalies in the CM vicinity. Twenty-one patients underwent microsurgical resection (5/23 simple lesionectomy, 16/23 lesionectomy + resection of the surrounding hemosiderin ring). All lesions were completely resected. No surgical mortalities or major complications occurred. CONCLUSION: Since pediatric CMs are more aggressive than adult CMs, they should not be underestimated. Microsurgical total resection should be the first treatment choice where possible. We concluded that early surgical treatment and resection of perilesional hemosiderin-stained tissue, when feasible, yield the most favorable results at long-term follow-up including seizure outcomes.

Endovascular treatment of posterior circulation aneurysms: Results from a single-team experience of 81 cases including 13 flow diversion treatment.

INTRODUCTION: Relatively constant surgical risks and rapid advances in endovascular treatment have caused a major shift toward endovascular management of posterior circulation aneurysms. This paper presents the results of a series of endovascularly treated posterior circulation aneurysms. METHODS: A total of 81 patients who underwent endovascular treatment of posterior circulation aneurysms performed by a single team between 2009 and 2019 were included. Demographic, clinical, radiologic, and management details were retrospectively obtained from hospital records. RESULTS: Among the included patients, 50 (61.7%) and 31 (38.3%) were female and male, respectively. Subarachnoid hemorrhage was observed in 30 patients (37%). Moreover, 40 (49.3%) aneurysms were treated with stent-assisted coiling, 1 (1.2%) aneurysm was treated with parent artery occlusion, 2 (2.4%) aneurysms were coiled using balloon assistance, 24 (29.6%) aneurysms were coiled primarily, 1 (1.2%) patient had an unsuccessful treatment attempt, and 13 (16.0%) aneurysms were treated with flow-diverter stents or stent monotherapy. During the last follow-up, 57 (83.8%) aneurysms were completely occluded, whereas 6 (8.8%) and 2 (2.9%) aneurysms did and did not have a residual neck, respectively. Flow diversion was used to treat 13 patients, among whom 8 had total occlusion or stable residue. A total of 7 deaths (8.6%) were encountered in this series. CONCLUSION: Endovascular treatment should be considered as the primary treatment modality for posterior circulation aneurysms. Despite the high morbidity and mortality rates, promising results can be achieved with correct patient selection. Flow diversion can be a feasible alternative for complex aneurysms that are difficult to treat.

Ripple-selective GABAergic projection cells in the hippocampus.

Ripples are brief high-frequency electrographic events with important roles in episodic memory. However, the in vivo circuit mechanisms coordinating ripple-related activity among local and distant neuronal ensembles are not well understood. Here, we define key characteristics of a long-distance projecting GABAergic cell group in the mouse hippocampus that selectively exhibits high-frequency firing during ripples while staying largely silent during theta-associated states when most other GABAergic cells are active. The high ripple-associated firing commenced before ripple onset and reached its maximum before ripple peak, with the signature theta-OFF, ripple-ON firing pattern being preserved across awake and sleep states. Controlled by septal GABAergic, cholinergic, and CA3 glutamatergic inputs, these ripple-selective cells innervate parvalbumin and cholecystokinin-expressing local interneurons while also targeting a variety of extra-hippocampal regions. These results demonstrate the existence of a hippocampal GABAergic circuit element that is uniquely positioned to coordinate ripple-related neuronal dynamics across neuronal assemblies.

Versatile Use of Intraoperative Ultrasound Guidance for Brain Puncture.

BACKGROUND: Intraoperative ultrasound (iUS) is an effective guidance and imaging system commonly used in neuro-oncological surgery. Despite the versatility of iUS, its utility for single burr hole puncture guidance remains fairly underappreciated. OBJECTIVE: To highlight the simplicity, versatility, and effectiveness of iUS guidance in brain puncture by presenting the current case series and technical note collection. METHODS: We present 4 novel uses of iUS guidance for single burr hole brain puncture: cannulation of normal-sized ventricles, endoscopic third ventriculostomy (ETV) guidance, evacuation of interhemispheric empyema, and stereotactic biopsy assistance. RESULTS: All techniques were performed successfully in a total of 16 patients. Normal-sized ventricles were cannulated in 7 patients, among whom 5 underwent Ommaya reservoir placement and 2 underwent ventriculoperitoneal shunt placement for idiopathic intracranial hypertension. No more than 1 attempt was needed for cannulation. All ventricular tip positions were optimal as shown by postoperative imaging. iUS guidance was used in 5 ETV procedures. The working cannula was successfully introduced to the lateral ventricle, providing the optimal trajectory to the third ventricular floor in these cases. Interhemispheric subdural empyema was aspirated with iUS guidance in 1 patient. Volume reduction was clearly visible, allowing near-total evacuation of the empyema. iUS guidance was used for assistive purposes during stereotactic biopsy in 3 patients. No major perioperative complications were observed throughout this series. CONCLUSION: iUS is an effective and versatile guidance system that allows for real-time imaging and can be easily and safely employed for various brain puncture procedures.

How I do it: ultrasound-guided placement of ommaya reservoir in a patient with small ventricles and cavum septum pellucidum.

BACKGROUND: Intraventricular chemotherapy via Ommaya reservoir is an important part of the treatment in patients with malignant central nervous system tumors. In these patients, catheter placement can be challenging due to the normal-sized ventricles. METHOD: Intraoperative ultrasound guidance was used for Ommaya reservoir placement in a 56-year-old patient with multiple intracranial and leptomeningeal metastases who had cavum septum pellucidum et vergae malformation. The catheter was successfully placed into the frontal horn of the lateral ventricle outside the cavum. CONCLUSION: Intraoperative ultrasound is a suitable image guidance system in patients with slit-like or normal-sized ventricles. It can also be used in patients with ventricular malformations.

Retraction: Primary cerebellopontine angle Rathke's cleft cyst: case report.

On behalf of all authors, I respectfully request the retraction of our article, "Primary Cerebellopontine Angle Rathke's Cleft Cyst: Case Report" (Turk Neurosurg, published online 2014, Vol: 24, No: 3; DOI: DOI: 10.5137/1019-5149. JTN.8084-13.1). This request is based on multiple problems with our study.