Parsonage–Turner Syndrome: A Case of Idiopathic Upper Extremity Paresis Following Middle Cranial Fossa Resection of a Vestibular Schwannoma

Objective: In this patient report, Parsonage–Turner syndrome (acute brachial neuropathy) developed in our patient 1 day after resection of a vestibular schwannoma by a middle cranial fossa approach. Aiming to increase awareness of this rare disorder among neurotologists, we describe differential diagnoses, work-up, and management strategies. Patient: A 67-year-old man treated for vestibular schwannoma at a single tertiary referral center. Intervention: Surgery for vestibular schwannoma, electromyography for confirmation of diagnosis, and physical therapy. Main Outcome and Results: After ruling out postoperative complications by intracranial imaging and physical examination, electromyography was confirmatory of the suspected diagnosis, Parsonage–Turner syndrome; steroids were not indicated. With physical therapy as treatment, our patient is experiencing gradual recovery of all neurologic deficits, including gross motor function. Conclusion: As a rare condition reported only sporadically in the orthopedic and neurology literature, our patient with Parsonage–Turner syndrome represents (to our knowledge) the first within neurotology literature. This rare, idiopathic disease process is usually self-limiting, and may mimic cerebral-vascular accident or injury from surgical positioning. Its presentation is one of limited motor and sensory neuropathies of the brachial plexus distribution.

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