Transitional Anomalies of the Lumbosacral Spine in Subjects Under 50 Years of Age: 75 Cases in Kati

Introduction: Lumbosacral transitional anomaly is a very common congenital malformation that is diagnosed incidentally. Our objective was to study lumbosacral transitional anomalies using computed tomography. Method: Our study was conducted in the medical imaging department of the Pr Bocar Sidy SALL University Hospital in Kati and the Amitie Medical Clinic in Kati. It was a cross-sectional study with retrospective and prospective recruitment from January 2023 to December 2024. All patients who underwent lumbosacral computed tomography and in whom a lumbosacral transitional anomaly was ob-served were included. The sampling was consecutive. We used the Castellvi classification to identify the types of anomaly. Anonymity and confidentiality were respected. Results: The overall prevalence of lumbosacral transitional anomalies was 3.99%, including 3.6% in the imaging department of the Pr Bocar Sidy SALL University Hospital in Kati and 5.03% at the Amitie medical clinic in Kati. The average age was 39±9 years, with extremes ranging from 15 to 48 years. Males were predominant (53.3%). Lumbar sciatica was the main clinical finding in 52% of cases. Computed tomography revealed sacralization in 74.7% of cases, 25% of which were Castellvi type IIIa. Lumbalization was noted in 25.3%, of which 36.8% were Castellvi type IIa. Conclusion: Lumbosacral transition anomalies remain common, and knowledge of them could help reduce the incidence of surgical interventions at the wrong site.