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Spastic paraplegia 4, autosomal dominant

Spastic paraplegia 4 (SPG4; also known as SPAST-associated HSP) is characterized by insidiously progressive bilateral lower-limb gait spasticity. More than 50% of affected individuals have some weakness in the legs and impaired vibration sense at the ankles. About one third have sphincter disturbances. Onset is insidious, mostly in young adulthood, although symptoms may start as early as age one year and as late as age 76 years. Intrafamilial variation is considerable. [from GeneReviews]

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Troyer syndrome

Troyer syndrome is characterized by progressive spastic paraparesis, dysarthria, and pseudobulbar palsy; distal amyotrophy; motor and cognitive delays; short stature; and subtle skeletal abnormalities. Most affected children exhibit delays in walking and talking followed by slow deterioration in both gait and speech. Emotional lability and affective disorders, such as inappropriate euphoria and/or crying, are common. Mild cerebellar signs are common. The most severely affected individuals have choreoathetosis. Life expectancy is normal. [from GeneReviews]

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