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A 60-year-old man sustained an undisplaced type III odontoid fracture following a fall down a full flight of stairs. His medical history was remarkable for a partial pancreatectomy and splenectomy in 2006 for chronic pancreatitis. This had rendered him diabetic, on insulin, and he required long-term administration of penicillin V. The fracture was treated with a halo vest, and, unknowing of its potentially serious consequences, the patient continued to tighten the halo pins himself. He presented 1 month later following a witnessed seizure. A computed tomography scan was performed, which demonstrated 2 cranial perforations, with the halo pins penetrating the cranium and resultant pneumocephalus. He was started on antiepileptic medication and was placed in a pinless halo system. He had no further seizures and has made an uneventful neurological recovery. This paper serves to highlight the potential complications which may arise from the use of a halo vest. Proper patient education is essential to avoid these serious yet avoidable events, and patients with low bone density and the immunosuppressed should be monitored closely.

Overtightening of halo pins resulting in intracranial penetration, pneumocephalus, and epileptic seizure