Pediatric Craniovertebral Junction Anomalies: A Literature Review

Pediatric craniovertebral junction (CVJ) abnormalities comprise a heterogeneous and multifaceted collection of congenital and CVJ malformations that involve the occipital bone, C1, and C2, as well as associated ligamentous structures. They have the potential to severely impair neurologic function through cervicomedullary junction compression, instability, or vascular insufficiency. Early diagnosis and urgent surgical intervention are crucial to optimizing neurological outcomes in children with this condition, but the anatomical and biomechanical features of the pediatric spine present special diagnostic and therapeutic challenges. Through an analysis of recent literature, we outline current diagnostic modalities and treatment strategies while emphasizing recent innovations in surgical planning and technique. Chiari malformation type I (CM-I) is the most common CVJ abnormality in children and is characterized by the downward protrusion of the cerebellar tonsils below the foramen magnum. CM-I is generally found in children undergoing MRI for symptoms such as headache, neck pain, or neurological dysfunction, and syringomyelia in a minority of instances. Atlantoaxial instability, often encountered in children with Down syndrome, and Grisel's syndrome, a non-traumatic atlantoaxial subluxation most commonly resulting from upper respiratory infections, are other common CVJ anomalies. They impact quality of life significantly and must be properly planned preoperatively to avoid the possibility of neurological injury. Advances in technology, including imaging using MRI, CT, and dynamic imaging, have greatly improved diagnosis and surgical planning for CVJ anomalies in children. Intraoperative navigation systems provide real-time images to permit precise screw placement, reducing neurovascular complications and improving the success of surgery. Three-dimensional printing technology allows for patient-specific surgical planning with enhanced anatomical visualization and individualized treatment plans. Minimally invasive techniques, such as endoscopic endonasal surgery, have also been promising in the treatment of some CVJ malformations, with benefits such as less tissue damage, shorter hospital stay, and faster recovery. However, these techniques require specialized training and equipment and are still being evaluated for their long-term efficacy. The use of autologous bone grafts, such as rib grafts, has also been effective, as evidenced by successful bone fusion and healing at the donor site in children. Prospective trials should focus on genetic and molecular aspects involved with CVJ anomalies because, according to newer data, the vast majority have a strong genetic involvement. Identifying the exact genetic etiologies will make for earlier and more individualized therapeutic regimens, which can maximize eventual long-term results in these individuals. Studies must be conducted to show the efficacy and reproducibility of the new procedures and technologies implemented within the decade.