Depends on etiology - acute traumatic injuries may need urgent or emergent surgery
Most idiopathic cases can be discharged with neurology/orthopedics follow up
Full recovery can take up to 2-3 years
Parsonage-Turner syndrome
Idiopathic
Down syndrome
Post-infectious
Kounis syndrome
Viral
Sheehan's syndrome
Epstein-Barr, CMV, influenza, parvovirus, coxsackie, HIV, Polio