neurologic disorders
Brachial Plexus and Lumbosacral Plexus Disorders
Key Points
Plexopathies are usually caused by compression or injury. Suspect a plexopathy if pain or peripheral neurologic deficits do not correspond to a nerve root or peripheral nerve distribution. Suspect acute brachial neuritis if patients have severe supraclavicular pain, followed by weakness and hyporeflexia that develop within days and resolve over months. In most cases, do electromyography and MRI or CT. Treat the cause. 