<unk>  is a syndrome characterized by psychomotor abnormalities, often presenting as a state of apparent unresponsiveness to external stimuli or inability to move normally in a person who is awake
Classically associated with schizophrenia, but may also present in bipolar, PTSD, autism, encephalitis, and other neurologic disorders
If left untreated, can progress into malignant<unk>  (20% mortality)
Catatonia
Hypoxic encephalopathy
Dysphonia
Acute toxic-metabolic encephalopathy 
Opsoclonus
Hypoglycemia
Tremor
Hyperosmolar state 