Parsonage-Turner syndrome involves bilateral AIN symptoms caused by brachial neuritis.
Classic history and presentation: AIN compression syndrome classically presents in a patient in the fourth decade of life with vague, poorly localized pain in the forearm and cubital fossa with motor deficits. Usually, these patients primarily complain of pain and do not have sensory changes. Most commonly, the motor deficits manifest as difficulty bringing the index finger and thumb together, difficulty with buttoning clothing, and difficultly forming a fist.
Prevalence: Less than 1% of all upper limb nerve syndromes
- Age – fourth decade
- Sex / gender – equal in males and females
Pathophysiology: AIN compression syndrome can be caused by transient neuritis (Parsonage-Turner syndrome), direct AIN compression, or compartment syndrome. Parsonage-Turner syndrome involves bilateral AIN symptoms caused by brachial neuritis.