A case report of postoperative atlantoaxial rotatory subluxation following craniotomy for pilocytic astrocytoma in a pediatric patient

Background: Pilocytic astrocytoma is a benign, slow-growing pediatric brain tumor, while Grisel’s syndrome refers to nontraumatic atlantoaxial subluxation classically associated with infection or head-and-neck surgery. Postoperative atlantoaxial rotatory subluxation following intracranial surgery is rare and poses significant diagnostic and management challenges. Case Description: We report a 7-year-old girl who presented with progressive headaches, imbalance, and signs of obstructive hydrocephalus. Imaging revealed a large cystic pilocytic astrocytoma involving the left frontotemporo-parietal region. The patient underwent left fronto-temporo-parietal craniotomy with excisional biopsy and placement of an Ommaya reservoir. Two weeks postoperatively, she developed painful neck spasm and mild torticollis. Cervical imaging confirmed C1–C2 rotatory subluxation (Fielding Type II), likely related to surgical positioning, with Grisel’s syndrome considered a possible inflammatory mechanism. Management included halo traction, closed reduction under general anesthesia, followed by halo vest immobilization and later application of a Miami-J cervical collar. The patient demonstrated good clinical and radiological recovery. Conclusion: This case highlights a rare postoperative complication of craniotomy with the development of atlantoaxial rotatory subluxation. Early recognition and multidisciplinary management are essential to prevent neurological sequelae. Surgical positioning may represent a contributing risk factor, and further research is required to establish preventive strategies.