Isolated Oculomotor Nerve Palsy Caused by Onodi Cell Sinusitis

Onodi cell sinusitis is a rare cause of isolated oculomotor nerve palsy. The sphenoid sinus and Onodi cell mucocele or invasive fungal sinusitis are often associated with multiple cranial-nerve symptoms simultaneously. However, isolated cranial nerve palsy due to simple sinusitis is rare. Sinus disease associated with cranial nerve palsy is difficult to diagnose based on patient history or physical examination alone; CT and MRI help in correctly assessing these lesions. Here we report a case of Onodi cell sinusitis observed in a patient who presented with isolated oculomotor nerve palsy. The patient underwent endoscopic sinus surgery and recovered completely at 2 months postoperative.