system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
The classical tetrad of peripheral neuropathy, retinitis pigmentosa, cerebellar ataxia and elevated CSF protein is found in which hereditary neuropathy?
assistant
The correct answer is  Refsum’s disease is autosomal recessive inborn error of metabolism . It is due to accumulation of phytanic acid in blood and tissues. Classical features include retinitis pigmentosa, peripheral neuropathy, cerebellar ataxia, elevated protein in CSF without increases in the number of cells.