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On behalf of the Editors, we wish to express our sincere gratitude to all authors and reviewers who contributed to the success of this Special Issue, titled “Intraoperative Visualization Techniques and Advanced Imaging in Brain Tumors” [...]

Purpose In Neurosurgery, stereotactic biopsy represents the main minimally invasive surgical technique to target deep and hard-to-reach brain sites that are not accessible by traditional surgical methods. The best trajectory for biopsy needle insertion is planned on the basis of CT or MRI studies. According to the relevant literature, although biopsy of the posterior cranial fossa with Leksell® Vantage™ Head Frame is possible, it involves several technical and clinical challenges. We describe an alternative configuration of the Leksell® Vantage™ system that addresses these limitations in the management of posterior cranial fossa lesions. Methods At our Department (IRCCS Ospedale Policlinico San Martino in Genoa) we have used Leksell® Vantage™ stereotactic system together with Medtronic StealthStation™ S8 planning software to perform a series of seven stereotactic biopsies in the occipital or cerebellar region by rotating the stereotactic helmet 180° on the axial plane, resulting in an inversion of both the anteroposterior and lateral–lateral axes. Results We demonstrate that stereotactic posterior fossa biopsies can be performed with helmet rotation, without additional procedural complications. No similar approach has previously been described in the literature. Conclusion This approach significantly enhances access to the posterior cranial fossa and occipital lesions. This optimisation improves manoeuvrability, provides a more advantageous viewing angle for the needle-biopsy trajectory and allows for a less complex preoperative planning. The approach remains minimally invasive and is generally compatible with execution under conscious sedation.

Purpose Arachnoid cysts may present with symptoms deriving from cyst rupture, usually causing intracystic hemorrhage and subdural hematoma or hygroma. Rupture is usually caused by minor trauma, spontaneous rupture is an exceptional event, and 57 cases have been described in literature. We here present and discuss the largest series of spontaneously ruptured middle fossa arachnoid cysts in order to investigate clinical presentation and best treatment available. Methods We report a retrospective series of 17 pediatric patients surgically treated for middle fossa arachnoid cyst with signs of cyst rupture without a history of trauma in the previous 90 days. We describe clinical presentation, treatment, and outcome at follow-up discussing our results with a literature review including all reported cases of spontaneous rupture of middle fossa arachnoid cysts. Results In our experience patients most frequently presented with subdural hygroma, in literature, a chronic hematoma was most frequently reported. Headache is the most reported symptom at presentation. Neurological deficits and consciousness alterations are rare. Surgical treatment may resolve brain compression only or reduce rupture recurrence risk. Conservative treatment has also been proposed. Different treatments are reported and discussed focusing on indications, contraindications, risks, and expected benefits. Conclusion We propose, when safely possible, microsurgical cyst fenestration in skull base cisterns as the treatment of choice for these patients as long as it addresses both immediate decompression and risk of rupture recurrence. We report good outcomes and low incidence of complications from our series with a mean postoperative follow-up of 30 months.

Background The effects of positive end-expiratory pressure (PEEP) on lung ultrasound (LUS) patterns, and their relationship with intracranial pressure (ICP) in brain injured patients have not been completely clarified. The primary aim of this study was to assess the effect of two levels of PEEP (5 and 15 cmH 2 O) on global (LUStot) and regional (anterior, lateral, and posterior areas) LUS scores and their correlation with changes of invasive ICP. Secondary aims included: the evaluation of the effect of PEEP on respiratory mechanics, arterial partial pressure of carbon dioxide (PaCO 2 ) and hemodynamics; the correlation between changes in ICP and LUS as well as respiratory parameters; the identification of factors at baseline as potential predictors of ICP response to higher PEEP. Methods Prospective, observational study including adult mechanically ventilated patients with acute brain injury requiring invasive ICP. Total and regional LUS scores, ICP, respiratory mechanics, and arterial blood gases values were analyzed at PEEP 5 and 15 cmH 2 O. Results Thirty patients were included; 19 of them (63.3%) were male, with median age of 65 years [interquartile range (IQR) = 66.7–76.0]. PEEP from 5 to 15 cmH 2 O reduced LUS score in the posterior regions (LUSp, median value from 7 [5–8] to 4.5 [3.7–6], p  = 0.002). Changes in ICP were significantly correlated with changes in LUStot (rho = 0.631, p  = 0.0002), LUSp (rho = 0.663, p  < 0.0001), respiratory system compliance (rho = − 0.599, p  < 0.0001), mean arterial pressure (rho = − 0.833, p  < 0.0001) and PaCO 2 (rho = 0.819, p  < 0.0001). Baseline LUStot score predicted the increase of ICP with PEEP. Conclusions LUS-together with the evaluation of respiratory and clinical variables-can assist the clinicians in the bedside assessment and prediction of the effect of PEEP on ICP in patients with acute brain injury.

Deep learning (DL) has been applied to glioblastoma (GBM) magnetic resonance imaging (MRI) assessment for tumor segmentation and inference of molecular, diagnostic, and prognostic information. We comprehensively overviewed the currently available DL applications, critically examining the limitations that hinder their broader adoption in clinical practice and molecular research. Technical limitations to the routine application of DL include the qualitative heterogeneity of MRI, related to different machinery and protocols, and the absence of informative sequences, possibly compensated by artificial image synthesis. Moreover, taking advantage from the available benchmarks of MRI, algorithms should be trained on large amounts of data. Additionally, the segmentation of postoperative imaging should be further addressed to limit the inaccuracies previously observed for this task. Indeed, molecular information has been promisingly integrated in the most recent DL tools, providing useful prognostic and therapeutic information. Finally, ethical concerns should be carefully addressed and standardized to allow for data protection. DL has provided reliable results for GBM assessment concerning MRI analysis and segmentation, but the routine clinical application is still limited. The current limitations could be prospectively addressed, giving particular attention to data collection, introducing new technical advancements, and carefully regulating ethical issues.

Background Chronic subdural hematoma (cSDH) is a common neurosurgical condition that is prevalent in elderly patients. There are no well-defined guidelines for cSDH and management strategies vary widely among physicians and institutions, and this variability is expressed in the literature. In general, conservative management is reserved to patients who are asymptomatic or have minor symptoms with mild mass effect. Spontaneous resolution of cSDH is an unusual phenomenon and middle meningeal artery (MMA) embolization seems to reduce the recurrence and progression rate of SDH compared to conventional treatments in multiple cohort studies. A randomized controlled trial is warranted to determine the effectiveness and safety of endovascular embolization for cSDH and whether MMA embolization is superior to conservative management in reducing the progression rate and surgical rescue event. Methods This is an Italian multicenter prospective randomized clinical trial with open-label treatment and blinded outcome assessment (PROBE design) to assess the superiority of MMA embolization compared to conservative treatment. A total of 300 patients are planned to be randomized 1:1 to receive MMA embolization (intervention) or conventional treatments (control). The primary outcome is the treatment arm failure which is defined as a composite of incomplete hematoma resolution or surgical rescue within 6 months follow-up. Incomplete hematoma resolution is defined as a reduction of the cSDH thickness ≤50% at follow-up compared to the hematoma thickness measured at the time of randomization. Surgical rescue is intended as hematoma removal for relief or symptoms that developed with continuous growth of the cSDH. In case of bilateral cSDH, the treatment failure occurred when primary outcomes criteria are satisfied for at least one of the two hematomas. Discussion This multi-centre randomized controlled trial is needed to evaluate the benefit-to-risk ratio of primary embolization of the MMA to facilitate resolution and prevent rescue surgical evacuation of cSDH. If MMA embolization turns out to be superior to conservative management in this trial, this may prompt further confirmatory trials and, at best, may change clinical practice and guideline recommendations. Trial registration ClinicalTrials.gov. Identifier: NCT06274580, Registered on 6 February 2024. This protocol was developed in accordance with the SPIRIT Checklist and by use of the structured study protocol template provided by BMC Trials.

Morning glory disc anomaly is a congenital abnormality of the optic disc and peripapillary retina reported as an isolated condition or associated with various anomalies, including basal encephaloceles and moyamoya vasculopathy. However, the co-occurrence of these three entities is extremely rare and the pathogenesis is still poorly understood. Moreover, data on the surgical management and long-term follow-up of the intracranial anomalies are scarce. Here, we describe the case of a 11-year-old boy with morning glory disc anomaly, transsphenoidal cephalocele, and moyamoya vasculopathy, who underwent bilateral indirect revascularization with encephalo-duro-myo-arterio-pericranio-synangiosis at the age of 2 years, and endoscopic repair of the transsphenoidal cephalocele at the age of 6 years. A rare missense variant (c.1081T>C,p.Tyr361His) was found in OFD1, a gene responsible for a X-linked ciliopathy, the oral-facial-digital syndrome type 1 (OFD1; OMIM 311200). This case expands the complex phenotype of OFD1 syndrome and suggests a possible involvement of OFD1 gene and Shh pathway in the pathogenesis of these anomalies.

Background Chloride intracellular channel-1 (CLIC1) activity controls glioblastoma proliferation. Metformin exerts antitumor effects in glioblastoma stem cells (GSCs) inhibiting CLIC1 activity, but its low potency hampers its translation in clinical settings. Methods We synthesized a small library of novel biguanide-based compounds that were tested as antiproliferative agents for GSCs derived from human glioblastomas, in vitro using 2D and 3D cultures and in vivo in the zebrafish model. Compounds were compared to metformin for both potency and efficacy in the inhibition of GSC proliferation in vitro (MTT, Trypan blue exclusion assays, and EdU labeling) and in vivo (zebrafish model), migration (Boyden chamber assay), invasiveness (Matrigel invasion assay), self-renewal (spherogenesis assay), and CLIC1 activity (electrophysiology recordings), as well as for the absence of off-target toxicity (effects on normal stem cells and toxicity for zebrafish and chick embryos). Results We identified Q48 and Q54 as two novel CLIC1 blockers, characterized by higher antiproliferative potency than metformin in vitro, in both GSC 2D cultures and 3D spheroids. Q48 and Q54 also impaired GSC self-renewal, migration and invasion, and displayed low systemic in vivo toxicity. Q54 reduced in vivo proliferation of GSCs xenotransplanted in zebrafish hindbrain. Target specificity was confirmed by recombinant CLIC1 binding experiments using microscale thermophoresis approach. Finally, we characterized GSCs from GBMs spontaneously expressing low CLIC1 protein, demonstrating their ability to grow in vivo and to retain stem-like phenotype and functional features in vitro. In these GSCs, Q48 and Q54 displayed reduced potency and efficacy as antiproliferative agents as compared to high CLIC1-expressing tumors. However, in 3D cultures, metformin and Q48 (but not Q54) inhibited proliferation, which was dependent on the inhibition dihydrofolate reductase activity. Conclusions These data highlight that, while CLIC1 is dispensable for the development of a subset of glioblastomas , it acts as a booster of proliferation in the majority of these tumors and its functional expression is required for biguanide antitumor class-effects. In particular, the biguanide-based derivatives Q48 and Q54, represent the leads to develop novel compounds endowed with better pharmacological profiles than metformin, to act as CLIC1-blockers for the treatment of CLIC1-expressing glioblastomas, in a precision medicine approach.

Objective Clinical and surgical decisions for glioblastoma patients depend on a tumor imaging-based evaluation. Artificial Intelligence (AI) can be applied to magnetic resonance imaging (MRI) assessment to support clinical practice, surgery planning and prognostic predictions. In a real-world context, the current obstacles for AI are low-quality imaging and postoperative reliability. The aim of this study is to train an automatic algorithm for glioblastoma segmentation on a clinical MRI dataset and to obtain reliable results both pre- and post-operatively. Methods The dataset used for this study comprises 237 (71 preoperative and 166 postoperative) MRIs from 71 patients affected by a histologically confirmed Grade IV Glioma. The implemented U-Net architecture was trained by transfer learning to perform the segmentation task on postoperative MRIs. The training was carried out first on BraTS2021 dataset for preoperative segmentation. Performance is evaluated using DICE score (DS) and Hausdorff 95% (H95). Results In preoperative scenario, overall DS is 91.09 (± 0.60) and H95 is 8.35 (± 1.12), considering tumor core, enhancing tumor and whole tumor (ET and edema). In postoperative context, overall DS is 72.31 (± 2.88) and H95 is 23.43 (± 7.24), considering resection cavity (RC), gross tumor volume (GTV) and whole tumor (WT). Remarkably, the RC segmentation obtained a mean DS of 63.52 (± 8.90) in postoperative MRIs. Conclusions The performances achieved by the algorithm are consistent with previous literature for both pre-operative and post-operative glioblastoma’s MRI evaluation. Through the proposed algorithm, it is possible to reduce the impact of low-quality images and missing sequences.