Since the majority of ACA cases result from a post-viral infection, the physician’s first question will be to ask if the patient has been recently ill. From this point a series of exclusion tests can determine if the current state of<unk>  is a correct diagnosis or not. A CT (computed tomography) scan with normal results can rule out the possibility of the presence of a posterior fossa tumor and an acute hemorrhage, which would both have abnormal results. Other imaging tests like EEG (electroencephalographs) and MRI (magnetic resonance imaging) can also be performed to eliminate possible diagnoses of other severe diseases, such as neuroblastoma, drug intoxication, acute labyrinthitis, and metabolic diseases. A more complicated test that is performed for research analysis of the disease is to isolate viruses from the CSF (cerebrospinal fluid). This can show that the virus has attacked the nervous system of the patient and resulted in the<unk>  symptoms. Differential diagnosis Differential diagnosis may include: * Opsoclonus-myoclonus-ataxia syndrome * Miller-Fisher syndrome * Meningoencephalitis * Cerebral abscess * Tumor * Hydrocephalus * Inner-ear disease * Acute vestibulitis * Acute labyrinthitis
Post viral cerebellar ataxia
Anti-NMDA receptor encephalitis
Anti-Hu associated encephalitis
Paraneoplastic cerebellar degeneration
Powassan encephalitis
Viliuisk encephalomyelitis
Acute cerebellar ataxia of childhood
Post-encephalitic parkinsonism