Fig. 1

Facial NCS, blink reflex tests, and pure tone audiometry of patients 1 and 2. In both patients, the blink reflex test reveals absent responses of ipsilateral R1 and R2 and contralateral R2 at stimulation of the right supraorbital nerve. Moreover, pure tone audiometry reveals both increased air and bone conduction thresholds without an air–bone gap in the right ears. In patient 1 (A), facial NCS reveals nonspecific findings, and in patient 2 (B), facial NCS reveals prolonged terminal latency and reduced compound muscle action potential amplitude at direct stimulation of the right facial nerve. These findings suggest right-sided facial neuropathy and sensorineural hearing loss in both patients. NCS, nerve conduction studies