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Posterior fossa decompression in syndromic children with chiari-like posterior fossa crowding: a nationwide US-based
Victor Gabriel El-Hajj1, Josué Aganze Mwambali2, Ihab Ahmad Al-Rikabi1
1Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.
Insights
Posterior fossa decompression (PFD) for syndromic Chiari-like crowding has higher complication rates than for Chiari-1 malformation (CM1). Syndromic cases require more reoperations, indicating a distinct clinical entity.
Area of Science:
- Neurosurgery
- Pediatric Surgery
- Genetics
Background:
- Posterior fossa crowding (PFC) due to cerebellar tonsil herniation often necessitates posterior fossa decompression (PFD).
- While Chiari-1 malformation (CM1) is a common cause, some cases involve syndromic conditions mimicking CM1 radiologically.
- Understanding differences in PFD outcomes between these groups is crucial for patient management.
Purpose of the Study:
- To compare outcomes of PFD between pediatric patients with true CM1 and those with syndromic Chiari-like crowding.
- To identify distinct baseline characteristics and short-term postoperative outcomes for each group.
Main Methods:
- A national pediatric surgical database (ACS NSQIP-P) was queried for patients undergoing PFD between 2012-2021.
- Baseline characteristics and 30-day postoperative outcomes were compared between syndromic and non-syndromic (CM1) cohorts.
- Multivariate logistic regression analyzed factors associated with readmission and reoperation.
Main Results:
- Of 6,910 PFD patients, 752 (11%) had associated syndromes (e.g., chondrodystrophies, fetal alcohol syndrome).
- Syndromic patients were younger, had lower BMI, more comorbidities, longer hospital stays, and higher rates of complications, readmissions, and reoperations (all p < 0.05).
- Adjusted analysis showed syndromic status independently predicted 30-day reoperation (OR 1.51) but not overall complications or readmissions.
Conclusions:
- Syndromic Chiari-like crowding presents with unique baseline features and increased short-term complications post-PFD compared to CM1.
- Syndromic patients require significantly more reoperations after PFD.
- These findings highlight syndromic cases as a distinct entity necessitating tailored management strategies.
Introduction:
Posterior fossa crowding, due to cerebellar tonsil herniation, often requires surgery with posterior fossa decompression (PFD). Although most cases are due to a Chiari-1 malformation (CM1), some are due to concomitant congenital conditions, mimicking a radiological CM1. The aim of this study was to compare PFD outcomes between CM1 and the syndromic Chiari-like crowding of the posterior fossa. A national pediatric surgical database was used to compare baseline characteristics and short-term postoperative outcomes.
Methods:
Pediatric patients undergoing PFD (2012-2021) were identified in the ACS NSQIP-P database. Baseline characteristics and 30-day outcomes were compared between syndromic and non-syndromic cases. Multivariate logistic regression identified factors associated with readmission and reoperation.
Results:
Among 6,910 patients who underwent PFD, 752 (11%) had associated syndromes or conditions. The most common syndromes were chondrodystrophies (28%), fetal alcohol syndrome (14%), and Klippel-Feil syndrome (10%). Syndromic patients were younger, had lower BMI, and exhibited a significantly higher prevalence of comorbidities, including pulmonary, gastrointestinal, cardiac, and neurological conditions (all p < 0.001). They also experienced longer hospital stays (mean 5.17 vs. 3.64 days; p = 0.010), higher rates of 30-day complications (12% vs. 8.7%; p = 0.003), readmissions (9.4% vs. 7.1%; p = 0.021), and reoperations (6.6% vs. 2.9%; p < 0.001). In adjusted analysis, syndromic cases were not independently associated with increased 30-day complications or readmissions but remained significantly associated with 30-day reoperation (OR 1.51; 95% CI 1.03-2.19; p = 0.032).
Conclusion:
The syndromic Chiari-like condition is associated with distinct baseline characteristics and higher short-term complication rates following PFD compared to true CM1. While syndromic status was independently associated with reoperation, it was not an independent predictor of overall complications or readmissions. These findings suggest that patients with syndromes mimicking CM1 represent a clinically and etiologically distinct entity, warranting tailored management and further investigation.
