Question: What is (are) Olivopontocerebellar atrophy ?
Answer: Olivopontocerebellar atrophy (OPCA) is a progressive condition characterized by the degeneration of nerve cells (neurons) in specific areas of the brain. It occurs in several neurodegenerative diseases, including multiple system atrophy (MSA) and inherited and non-inherited forms of ataxia. OPCA may also occur in people with prion disorders and inherited metabolic diseases. The main symptom is clumsiness that slowly gets worse. Other symptoms may include problems with balance; speech or swallowing problems; difficulty walking; abnormal eye movements; muscle spasms; and neuropathy. Whether OPCA is inherited (and the inheritance pattern) depends on the underlying cause, if known. There is no cure for OPCA, and management aims to treat symptoms and prevent complications.
Source: GARD

Question: How to diagnose Olivopontocerebellar atrophy ?
Answer: How is olivopontocerebellar atrophy diagnosed? A diagnosis of olivopontocerebellar atrophy (OPCA) may be based on a thorough medical exam; the presence of signs and symptoms; imaging studies; various laboratory tests; and an evaluation of the family history. MRI of the brain may show characteristics of OPCA, such as specific changes in the size of affected parts of the brain. This is more likely as the disease progresses; it is possible to have OPCA and have a normal brain MRI (especially within the first year of symptom onset). Hereditary OPCA may be suspected based on having a family history, and may be diagnosed by genetic testing (when available) for the condition suspected or known to be present in the family. Sporadic OPCA may be diagnosed if hereditary forms of OPCA, and other conditions associated with OPCA, have been ruled out.
Source: GARD