Axillary nerve dysfunction

Alternative names:

neuropathy - axillary nerve

Symptoms:

• numbness over part of the outer shoulder
• shoulder weakness
  • difficulty lifting objects with the affected arm
  • difficulty lifting arm above the head

Signs and tests:

A neuromuscular examination of the arm and shoulder indicates axillary nerve dysfunction. There may be weakness of the shoulder, with difficulty moving the arm toward the center of the body (adduction). The deltoid muscle of the shoulder may show signs of muscle atrophy. A detailed history may be needed to determine the possible cause of the neuropathy.

Tests that reveal axillary nerve dysfunction may include:

• an EMG (a recording of electrical activity in muscles)
• a nerve biopsy (may reveal systemic causes for the dysfunction)

Other tests are guided by the suspected cause of the nerve dysfunction, as suggested by the history, symptoms presented, and pattern of symptom development. They may include various blood tests, X-rays, scans, or other tests and procedures.