Paralytic brachial neuritis or Parsonage-Turner syndrome anterior interosseous nerve involvement. Report of three cases.

Paralytic brachial neuritis or Parsonage-Turner syndrome principally involves the shoulder girdle, rarely muscles moving the hand and fingers. Three cases are reported. After an acute episode with severe pain in the arm and fore-arm there appeared, a palsy of flexor pollicis longus and flexor indicis profundus, due to an isolated lesion of the anterior interosseous nerve. Two cases spontaneously recovered their full function, the third incompletely. Delay in recovery may be long; more than two years. Mechanical nerve entrapement should not be confused with this syndrome.