Notes

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In the second group (n=6), where the novel transaxis approach was implemented, a single complication was encountered: occipital plate malposition.
This research details, to the best of the authors' understanding, the inaugural comparison of a new surgical method for odontoid resection with a well-established technique in individuals with basilar invagination (BI). Early results support the successful implementation of the transaxis technique in odontoid resection, fulfilling all the required therapeutic objectives in a single-stage operation. The transaxial procedure, with its improved safety profile and reduced operative time, is potentially a primary approach for the handling of BI.
This research, in the authors' opinion, represents the first comparative evaluation of an innovative odontoid resection technique versus a conventional surgical procedure for patients with basilar invagination (BI). Early results endorse the usefulness of the transaxis approach in odontoid resection, meeting all the surgical objectives in a single-stage operation. The transaxial technique, characterized by diminished surgical risks and operative timeframe, can be viewed as a primary option for BI.

Surgical approaches for Chiari I malformation and basilar invagination have been the subject of significant and ongoing controversy over the past few years. This paper's treatment algorithm for these disorders is grounded in radiologic findings, intraoperative observations, and long-term outcome data analysis.
Eighty-five operations were performed on 82 patients with basilar invagination (mean age: 40 ± 18 years, range: 9–75 years), resulting in a mean follow-up period of 57 ± 55 months. Neurological examinations, both pre- and post-surgery, along with radiological features and intraoperative findings, were all analyzed. Employing Kaplan-Meier statistics, long-term outcomes were evaluated. The 77 patients who presented with a Chiari I malformation all had foramen magnum decompression, followed by arachnoid dissection and duraplasty. The management strategy for patients with odontoid peg-induced ventral compression involved posterior realignment and C1-2 fusion. C1-2 fusion was not performed on patients without ventral compression unless signs of instability were apparent radiographically or clinically.
Foramen magnum decompression, without additional fusion, was performed on thirty-three patients exhibiting neither ventral compression nor instability; in contrast, 52 operations on 49 patients incorporated posterior fusion at C0-2 or C1-2, subsequent to the correction of ventral compression and/or the treatment of C1-2 instability. Following surgery, both treatment groups experienced substantial improvements in gait ataxia, swallowing abilities, and suboccipital pain. Improvements were observed in 79% of patients who underwent only foramen magnum decompression, and 73% of those who underwent fusion procedures, which could include foramen magnum decompression. At the 10-year mark, progression-free survival reached 83% and 81% respectively.
In the cohort of patients with basilar invagination, a segment representing 402% of the included cases achieved successful long-term treatment outcomes, exclusively via foramen magnum decompression, dispensing with any supplementary fusion procedures. This subgroup displayed a lack of ventral compression, no atlantoaxial dislocation, and lacked any other indicators of craniocervical instability. A C1-2 fusion procedure, followed by posterior realignment of ventral compression if necessary, was undertaken in the remaining patient population. In situations where Chiari I malformation coexists with basilar invagination, surgical decompression of the foramen magnum, accompanied by duraplasty, is the appropriate treatment.
In the patient group characterized by basilar invagination, a significant subgroup, encompassing 402 percent of the patients analyzed, experienced successful long-term treatment using foramen magnum decompression alone, eschewing any additional fusion procedures. This subgroup lacked ventral compression, atlantoaxial dislocation, and any other signs of craniocervical instability. For the subsequent group of patients, the course of treatment involved C1-2 fusion, with posterior realignment of ventral compression, if such intervention was deemed suitable. The presence of basilar invagination dictates that a Chiari I malformation be treated surgically with foramen magnum decompression and duraplasty procedures.

Chiari malformation type I (CM-I) coupled with syringomyelia (syrinx) is frequently addressed through posterior fossa decompression, often resulting in resolution. For this reason, a lingering syrinx following decompression is unusual, and its treatment requires a careful and multi-faceted approach. Persistent syrinx, even with radiographically adequate decompression, prompts the authors to favor fourth ventricular subarachnoid stents extending across the craniocervical junction, particularly if intraoperative findings show arachnoid plane scarring. Evaluating the safety and effectiveness of a fourth ventricle stent for treating CM-I-associated persistent syringomyelia was the goal of this study, encompassing the analysis of syrinx dimension changes, assessment of the stent's long-term impact on reducing syrinx size, documenting clinical outcomes, and reporting on any procedure-related complications.
A review, performed retrospectively at a single institution, assessed patients who received fourth ventricular subarachnoid stents for persistent syringomyelia resulting from CM-I, following a prior posterior fossa decompression. tpca-1 inhibitor From the authors' institutional Chiari database, a total of 600 cases were identified, showing 149 decompressions for CM-I-associated syringomyelia. Remarkably, only 13 of these cases fulfilled the inclusion criteria. Data on patient demographics, clinical presentation specifics, outcomes, and MRI scans were collected. The process of determining the maximal syrinx diameter involved calculating the area of the elliptical cross-section in the largest axial plane from the preoperative, immediately postoperative, and late postoperative T2-weighted MR image data sets.
The late postoperative MRI scans of all 13 patients exhibited a substantial decrease in mean syrinx area when compared with the preoperative scans (mean syrinx diameter: 1141 ± 818 mm² versus 245 ± 238 mm², p < 0.0001). The mean duration until a late postoperative MRI was performed was 197 months, varying from a shortest interval of 20 months to a longest interval of 707 months. Measurements from the final postoperative scan showed an average reduction of the syrinx area to 750% and 239% of its original size. Resolution of Syrinx varied among patients. Four patients (308%) experienced near-complete resolution (greater than 90%, grade III). Seven patients (50%) had a moderate resolution (50%–90% reduction, grade II). Two patients (14.3%) had less than a 50% improvement (grade I). Following catheter insertion, a cyst developed at the tip of the catheter, positioned within the left brachium pontis, and subsequently diminished in size according to follow-up imaging.
In patients with persistent CM-I-associated syringomyelia following posterior fossa decompression, the strategic placement of fourth ventricular subarachnoid stents across the craniocervical junction constitutes a safe therapeutic choice, leading to a significant decrease in the mean syrinx area; this reduction in area exhibits a more pronounced effect with longer follow-up times.
Patients with persistent CM-I-associated syringomyelia post-posterior fossa decompression benefitted from the safe application of fourth ventricular subarachnoid stents that encompassed the craniocervical junction. This treatment proved highly effective in reducing the average syrinx area, with a more profound result exhibited over a longer period of follow-up.

Decompressive surgery for symptomatic Chiari I malformation targets the craniovertebral junction. Neuromonitoring during surgery (IONM) is a practice in some institutions for safe decompression procedures, due to the critical brainstem structures being so near. Despite its inclusion in the procedure, IONM entails increased time and cost, and the resultant benefits for the patient remain indeterminate. The variety of surgical techniques employed leads to a void in evidence-based recommendations for the correct timing and most helpful modalities when utilizing IONM. To determine the sensitivity, specificity, and predictive values of IONM modalities in pediatric Chiari I decompression performed by a single surgeon, this study reviewed their experience. It investigated potential associations between patient, clinical, and imaging factors and IONM alerts. Furthermore, the study sought to gauge the modalities' practical value in surgical decision-making for improved patient results.
A retrospective analysis was performed on 300 consecutive pediatric patients who underwent Chiari decompression by a single surgeon—the procedure involving suboccipital craniectomy and C1 laminectomy—over a 15-year period. Data from clinical, radiographic, and IONM sources were systematically gathered. Radiographic assessments of skull base structural anomalies, including clival angle, Chamberlain's line, and Grabb-Oakes line, were contrasted in patients exhibiting and lacking evident IONM signal changes.
291 cases were examined, with ages ranging between 6 months and 19 years. From a cohort of 291 patients, somatosensory evoked potentials (SSEPs) were observed in all, with motor evoked potentials (MEPs) monitored in 209, cranial nerve spontaneous electromyography (sEMG) in 290 cases, and brainstem auditory evoked potentials (BAEPs) in 110. SSEPs achieved a flawless score of 100 across the board for sensitivity, specificity, positive predictive value, and negative predictive value. MEPs, conversely, showcased 100% sensitivity and specificity, 67% positive predictive value, and a perfect 100% negative predictive value. sEMG demonstrated a unique profile with 0% sensitivity and positive predictive value, 88% specificity, and 100% negative predictive value. BAEPs, in contrast, lacked data for sensitivity and positive predictive value, but recorded a perfect 100% specificity and 100% negative predictive value.
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