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Hypochondroplasia is a disorder caused by FGFR3 mutations, commonly featuring short limbs and stature. Thanatophoric dysplasia, achondroplasia and Muenke syndrome are genetically related conditions with skeletal dysplasia and temporal lobe dysgenesis. We present a 6-month old boy with hypochondroplasia and epilepsy. His brain MRI revealed bilateral temporal lobe dysplasia, with redundant sulci and a rotated hippocampus. The neuroimaging findings of our case provide direct insight in the pathogenesis of the cerebral dysgenesis in FGFR3-related disorders. In addition, through this case we review the neurological spectrum of FGFR3 mutations.