anterior interosseous nerve syndrome; Kiloh-Nevin syndrome

Etiology

• transient neuritis (most common)
• compression of the anterior interosseous nerve
  • primary nerve tumor or nerve sheath tumor
  • ganglion cyst
  • osseous spur
  • anatomical variants
• trauma to the median nerve

Pathology

• damage to the anterior interosseous nerve, a motor branch of the median nerve

Clinical manifestations

• pain in the forearm
• weakness of the pincer movement of the thumb & index finger

Diagnostic procedures

• electromyography
  • abnormalities in the flexor pollicis longus, flexor digitorum profundus 1 & 2 & pronator quadratus

Radiology

• ultrasound or magnetic resonance imaging for suspected entrapment neuropathy

Management

• surgical decompression for entrapment neuropathy

More general terms

• syndrome
• entrapment neuropathy; nerve entrapment syndrome; pinched nerve