A 5-yr-old girl with Arnold-Chiari Malformation, Type 1, was accidentally tracheally extubated while positioned prone in a Mayfield neurosurgical headrest during a decompressive craniectomy and cervical laminectomy. While preparations were being made to return the patient to the supine position for reintubation, we placed a laryngeal mask airway (LMA) without difficulty. The child was kept in the prone position with the LMA in place using positive-pressure ventilation for the remainder of the operation. This case report emphasizes the practical, emergent use of a LMA to secure the airway of a pediatric patient in the prone position after accidental extubation.