| A complex type of hereditary spastic paraplegia with onset in adolescence or adulthood of slowly progressive spastic paraparesis associated with the additional manifestations of apraxia, cognitive and speech decline (leading to dementia and akinetic mutism in some cases), personality disturbances and extrapyramidal (oromandibular dyskinesia, rigidity) and cerebellar (dysdiadochokinesia and incoordination) signs. Subtle abnormalities (for example developmental delay) may be noted earlier in childhood. A thin corpus callosum and white matter abnormalities are equally reported on magnetic resonance imaging. |
