Objective: To determine if preoperative radiographic images can predict whether a schwannoma of the parapharyngeal space originates from the vagus nerve or the cervical sympathetic chain.
Design: A retrospective review of 12 patients who underwent surgical resection of schwannomas of the parapharyngeal space. The nerve of origin was identified based on operative findings and postoperative physical examinations. Eleven patients (11 of 12) had preoperative magnetic resonance imaging (MRI) studies and 1 patient (1 of 12) underwent a contrast-enhanced computerized tomography scan. A neuroradiologist reviewed the imaging studies, blinded to the surgically determined nerve of origin. For each case, it was predicted whether the tumor arose from the vagus nerve or sympathetic chain based on the location of the schwannoma with reference to the carotid sheath vessels.
Saito DM, Glastonbury C, El-Sayed I, Eisele D. P008 Preoperative Imaging Diagnosis of the Nerve of Origin in Schwannomas of the Parapharyngeal Space. Arch Otolaryngol Head Neck Surg. 2006;132(8):867. doi:10.1001/archotol.132.8.867-a