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Persistent inability to bring the hand to the mouth with the elbow stabilized at the side
20%
149/749
Persistent inability to actively abduct the arm past 90 degrees
5%
34/749
Persistent inability to externally rotate the shoulder past 20 degrees
2%
17/749
Persistent unilateral ptosis, myosis, and anhydrosis
71%
533/749
History of clavicle fracture at birth
1%
9/749
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Persistent Horner’s sign (ptosis, myosis, and anhydrosis) is a sign of proximal injury, usually avulsion of the roots from the cord which disrupts the sympathetic chain. Root rupture or avulsion proximal to the myelin sheath has less chance of healing. Two-month-old infants with persistent weakness in the other areas described may still have a good prognosis for recovery. Concurrent clavicle fracture has been shown to have no prognostic value.
3.2
(14)
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