Achondroplasia is a genetic bone disorder in which a child's arms and legs are short in proportion to their body length. It is the most common type of dwarfism. Achondroplasia is inherited by an autosomal dominant gene that causes abnormal cartilage formation. This sagittal T1-weighted MRI image shows some of the abnormalities found in an achondroplasia skull. There is a large cranial top with a small skull base. There is a kink in the cerviomedullary area. The forehead is prominent with a depressed nasal bridge. The foramen magnum is narrowed and the suprasellar cistern is enlarged. Also to go with what we learned about this week the straight sinus is vertically oriented instead of the normal horizontal orientation.
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