Any disturbance in coordination of movement
Most cases in ED will be acute (<72h), but can also be episodic or chronic
Etiology usually benign in previously healthy child
Most cases will be postinfectious cerebellitis, drug ingestion, or Guillain Barre
Ataxia 
Systemic conditions
Dysphonia
Intoxications with diminished alertness
Dysphagia
Ethanol
Diplopia
Sedative/hypnotic toxicity