Ahn, Edward S.

Fetal repair of myelomeningocele remains an effective intervention to decrease hindbrain herniation and reduce the need for postnatal CSF shunting. Effectiveness depends on a watertight closure; however, there are challenges to achieving such. Often, a separate, watertight dural closure is difficult due to the thinness and fragility of the dural membrane. This video demonstrates the approach utilizing a previously described myofascial rotation of the bilateral paraspinal muscles to construct a robust closure even without the need for a separate dural closure or patch reinforcement. This method has been associated with improved primary closure rates and fewer postnatal procedures. The video can be found here: https://stream.cadmore.media/r10.3171/2026.1.FOCVID25235

Surgical outcomes and perioperative factors associated with pediatric cranioplasty remain incompletely understood. The authors queried the National Surgical Quality Improvement Program-Pediatric (NSQIP-P) database to evaluate outcomes and intraoperative/postoperative blood transfusions in patients undergoing cranioplasty between 2019 and 2023. A total of 249 patients (mean age 9.1 ± 5.4 y) were included. Most cranioplasties (70.7%) utilized alloplastic materials compared with autologous. Blood transfusion was required in 24.1% of cases, predominantly on the day of surgery (86.7%). Multivariable analysis identified age (OR: 0.86 per year, 95% CI: 0.80–0.93, P < 0.001) and cranioplasty size >5 cm (versus ≤5 cm) (OR: 2.10, 95% CI: 1.01–4.50, P = 0.049) as predictors of transfusion. The 30-day unplanned readmission rate was 5.3% at a mean of 14.6 ± 7.9 days from surgery, most commonly for a surgical site infection (33.0%). The 30-day unplanned reoperation rate was 2.9%, at a mean of 10.2 ± 5.6 days. Autologous cranioplasty was not associated with higher odds of readmission (OR: 0.79, 95% CI: 0.25–2.13, P = 0.66) or reoperation (OR: 5.04, 95% CI: 0.96–36.99, P = 0.07) compared with alloplastic cranioplasty. Rates of readmission and reoperation following pediatric cranioplasty are comparable to other complex craniofacial procedures. Younger age and larger cranioplasty size are associated with higher rates of blood transfusion. Our results show that autologous reconstruction is not associated with higher short-term complication rates compared with alloplastic reconstruction, although future studies are still needed to further the understanding of the optimal cranioplasty material.

Objective We aimed to understand the impact of Cranial Remolding Orthotic therapy (CRO) on the quality of life of both infants with positional deformational head shape abnormalities (PDHSAs), including plagiocephaly and brachycephaly, and their caregivers. Design Survey study. Setting A single, tertiary academic center. Patients, Participants Families of infants with PDHSAs who underwent CRO between 2007 and 2022. Interventions CRO. Main Outcome Measure(s) Subjective assessment of caregiver perspectives. Results We obtained 242 responses (72% male) from 1013 patients contacted (response rate 23.9%). CRO was initiated at a median age of 6 months (IQR 5-7 months), with a median treatment duration of 4 months (IQR 3-5 months). Insurance covered costs fully for 9.8% of respondents and partially for 47.0%; 43.2% paid completely out-of-pocket. Most were “very satisfied” or “satisfied” with head shape (89.2%) and ear position (93.3%). CRO did not impact children's sleep (75.2%), “never” or “rarely” impacted children's play (90.5%), and never impacted most families’ attendance of social events (91.3%). Hair loss was temporary in 29.9% and permanent in 0.8%. Most families did not find CRO burdensome (73.1%) and “never” or “rarely” felt fatigued (68.5%). Conclusions The study sheds light on the mental and social effects of CRO on patients and caregivers, as well as physical adverse effects associated with treatment. Overall, patients’ families expressed satisfaction with results and felt that administering CRO had minimal negative impacts on themselves and their children.

OBJECTIVE The American Association of Neurological Surgeons (AANS) and Congress of Neurological Surgeons (CNS) Section on Pediatric Neurological Surgery domestic traveling fellowship was created to cover the travel and living expenses for a North American neurosurgery resident for 1 month at another institution to gain experience in pediatric neurosurgery. The objective of this work was to guide future direction by surveying past recipients about the fellowship and its impact on their training and career. METHODS Historical data have been maintained by the AANS/CNS Executive Committee and past and current chairs of the Traveling Fellowship Subcommittee. A 10-question REDCap survey was emailed to all previous fellowship recipients. RESULTS There have been 58 recipients of the traveling fellowship since 1998. The most common host program was Boston Children’s Hospital (n = 21), followed by The Hospital for Sick Children (n = 12). Excluding recent recipients after 2017 who may still be working toward certification, 20 of 38 (53%) recipients have been certified by the American Board of Pediatric Neurological Surgery (ABPNS). Twenty-four of 49 (49%) recipients completed the survey. Twenty (83.3%) respondents were either ABPNS certified or planning to seek certification, 17 (70.8%) respondents’ practices consisted of > 50% patients aged ≤ 21 years, and 18 (75%) spent 4–8 weeks at the host program, which was longer than the 1 month funded by the stipend. Twenty-two (91.7%) respondents would recommend the traveling fellowship to a resident interested in pediatric neurosurgery, and 18 (75%) believed the traveling fellowship helped them decide to pursue a career in pediatric neurosurgery, while 17 (70.8%) found that the professional connections they made were the most useful aspect of the fellowship. Fifteen (62.5%) respondents believed that the stipend of $2500 was inadequate to cover the cost of traveling and housing. CONCLUSIONS The majority of respondents are currently practicing pediatric neurosurgeons, would recommend the traveling fellowship to residents interested in neurosurgery, and believed that the experience helped them decide to pursue a career in pediatric neurosurgery. Opportunities for improvement include increasing the stipend to more appropriately fund rotations that have mostly been longer than 1 month.

BACKGROUND Posttraumatic retroclival hematomas are rare pathologies among pediatric patients and can result in cranial nerve palsies. The authors sought to survey the literature and characterize the risk factors, treatment considerations, and overall outcomes for pediatric patients experiencing posttraumatic retroclival hematomas. OBSERVATIONS A search of the Ovid Embase, Scopus, PubMed, and Web of Science databases from January 1986 to May 2024 was performed following Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Additionally, the authors report a novel case of pediatric retroclival hematoma. The systematic review identified 41 eligible articles describing 64 individual cases of posttraumatic clival/retroclival hematoma in pediatric patients. The incidence of abducens nerve palsy in the setting of posttraumatic retroclival hematoma was 40%, and the rate of complete recovery of abducens nerve function was 73%. Analyses revealed that a higher initial Glasgow Coma Scale (GCS) score correlated with general neurological recovery (p < 0.05). However, no significant difference was found in GCS scores between patients with complete and those with incomplete abducens nerve recovery. LESSONS There is a high rate of spontaneous recovery of abducens nerve function in patients with abducens palsy in the setting of posttraumatic retroclival hematoma. While initial GCS scores can predict general neurological recovery, factors influencing abducens nerve palsy resolution remain unclear. https://thejns.org/doi/10.3171/CASE24474

Objective Dermoid cyst (DC) is a congenital cyst with the potential to have intracranial extension (ICE). This study aims to evaluate the imaging yield and surgical outcomes of nasal, medial brow, forehead, and scalp DCs. Design Retrospective review of craniofacial DCs treated at our institution between 1992 and 2024. Results A total of 117 patients (57 females) were included. The median age at cyst detection and removal were 4.8 months (IQR 3.6-9.6) and 1.8 years (IQR 0.9-5.3), respectively. In 42 patients, parents have noticed the presence of the cyst immediately after birth. Cyst wall rupture during surgical removal was reported in 15.4%. The median follow-up time was 1.3 months (IQR 0.5-12.2). Three patients experienced recurrence. No postoperative complication was reported. The regions with the highest prevalence of ICE were the forehead, frontotemporal scalp, and nasal region. The lateral frontal/temporal scalp had a 33.3% rate of ICE. Midline forehead/scalp lesions demonstrated a higher risk of ICE compared to their lateral equivalents (54.5% vs 17.5%, P = .03). The sensitivity and specificity of magnetic resonance imaging (MRI) were 100% and 95.7%, while for computed tomography (CT scans) were 72.7% and 96.5%. The Area Under the Curve for MRI was 0.978, and for CT was 0.846. The sensitivity and specificity of ultrasound were 50% and 100%. Conclusions Midline forehead/scalp DCs are more prone to extend intracranially than lateral DCs. MRI had a higher sensitivity and specificity than CT scans in detecting ICE. Routine screening imaging should be considered in midline forehead/scalp, lateral frontal/temporal, and nasal DCs.

OBJECTIVE Chiari malformation type I (CM-I) is a congenital disorder occurring in 0.1% of the population. In symptomatic cases, surgery with posterior fossa decompression (PFD) is the treatment of choice. Surgery is, however, associated with peri- and postoperative complications that may require readmission or renewed surgical intervention. Given the associated financial costs and the impact on patients’ well-being, there is a need for predictive tools that can assess the likelihood of such adverse events. The aim of this study was therefore to leverage machine learning algorithms to develop a predictive model for 30-day readmissions and reoperations after PFD in pediatric patients with CM-I. METHODS This was a retrospective study based on data from the National Surgical Quality Improvement Program–Pediatric database. Eligible patients were those undergoing PFD (Current Procedural Terminology code 61343) for CM-I between 2012 and 2021. Patients undergoing surgery for tumors or vascular lesions were excluded. Unplanned 30-day readmission and unplanned 30-day reoperation were the main study outcomes. Additional outcome data considered included the length of hospital stay, 30-day complications, discharge disposition, and 30-day mortality. Training and testing samples were randomly generated (80:20) to study the 30-day readmission and reoperation using logistic regression, decision tree, random forest (RF), K-nearest neighbors, and Gaussian naive Bayes algorithms. RESULTS A total of 7106 pediatric patients undergoing PFD were included. The median age was 9.2 years (IQR 4.7, 14.2 years). Most of the patients were female (56%). The 30-day readmission and reoperation rates were 7.5% and 3.4%, respectively. Headaches (32%) and wound-related complications (30%) were the most common reasons for 30-day readmission, while wound revisions and evacuation of fluid or blood (62%), followed by CSF diversion-related procedures (28%), were the most common reasons for 30-day reoperation. RF classifiers had the highest predictive accuracy for both 30-day readmissions (area under the curve [AUC] 0.960) and reoperations (AUC 0.990) compared with the other models. On feature importance analysis, sex, developmental delay, ethnicity, respiratory disease, premature birth, hydrocephalus, and congenital/genetic anomaly were some of the variables contributing the most to both RF models. CONCLUSIONS Using a large-scale nationwide dataset, machine learning models for the prediction of both 30-day readmissions and reoperations were developed and achieved high accuracy. This highlights the utility of machine learning in risk stratification and surgical decision-making for pediatric CM-I.

Abstract We present the case of a 3-week-old girl with LUMBAR syndrome, a rare condition involving segmental infantile hemangiomas (IH) in the lumbosacral region, myelopathy, and other congenital anomalies. The patient developed severe ulceration of a left buttock IH. Treatment included broad-spectrum antibiotics, debridement, and a laparoscopic temporary colostomy. Propranolol therapy, wound care, and fecal diversion led to successful healing of the ulceration. The report highlights the challenges of ulcerated IH in the perineal area due to exposure to urine and stool. The comprehensive approach resulted in positive outcomes, including the successful surgical treatment of spinal dysraphism, successful colostomy reversal, and developmental progress. This case contributes insight into the surgical management of severe perianal ulcerated IH associated with LUMBAR syndrome, highlighting the importance of a tailored surgical approach with a multidisciplinary framework.

OBJECTIVE Sagittal craniosynostosis is the most common form of craniosynostosis and typically results in scaphocephaly, which is characterized by biparietal narrowing, compensatory frontal bossing, and an occipital prominence. The cephalic index (CI) is a simple metric for quantifying the degree of cranial narrowing and is often used to diagnose sagittal craniosynostosis. However, patients with variant forms of sagittal craniosynostosis may present with a "normal" CI, depending on the part of the suture that is closed. As machine learning (ML) algorithms are developed to assist in the diagnosis of cranial deformities, metrics that reflect the other phenotypic features of sagittal craniosynostosis are needed. In this study the authors sought to describe the posterior arc angle (PAA), a measurement of biparietal narrowing that is obtained with 2D photographs, and elucidate the role of PAA as an adjuvant to the CI in characterizing scaphocephaly and the potential relevance of PAA in new ML model development. METHODS The authors retrospectively reviewed 1013 craniofacial patients treated during the period from 2006 to 2021. Orthogonal top-down photographs were used to calculate the CI and PAA. Distribution densities, receiver operating characteristic (ROC) curves, and chi-square analyses were used to describe the relative predictive utility of each method for sagittal craniosynostosis. RESULTS In total, 1001 patients underwent paired CI and PAA measurements and a clinical head shape diagnosis (sagittal craniosynostosis, n = 122; other cranial deformity, n = 565; normocephalic, n = 314). The area under the ROC curve (AUC) for the CI was 98.5% (95% confidence interval 97.8%–99.2%, p < 0.001), with an optimum specificity of 92.6% and sensitivity of 93.4%. The PAA had an AUC of 97.4% (95% confidence interval 96.0%–98.8%, p < 0.001) with an optimum specificity of 94.9% and sensitivity of 90.2%. In 6 of 122 (4.9%) cases of sagittal craniosynostosis, the PAA was abnormal while the CI was normal. This means that adding a PAA cutoff branch to a partition model increases the detection of sagittal craniosynostosis. CONCLUSIONS Both CI and PAA are excellent discriminators for sagittal craniosynostosis. Using an accuracy-optimized partition model, the addition of the PAA to the CI increased model sensitivity compared to using the CI alone. Using a model that incorporates both CI and PAA could assist in the early identification and treatment of sagittal craniosynostosis via automated and semiautomated algorithms that utilize tree-based ML models.