MVK and hyperinsulinemic hypoglycemia, familial, 4: The following specific keywords were used: (“mevalonic aciduria” OR “mevalonate kinase deficiency” OR “hyperimmunoglobulinaemia d”) AND (“magnetic resonance imaging” OR “MRI” OR “computed tomography” OR “imaging” OR “neuroimaging” OR “spectroscopy.”) The search was performed independently in PubMed and EMBASE databases.