Autosomal spastic paraplegia type 58 (SPG58) is a rare, inherited neurological disorder characterized by progressive muscle weakness and stiffness (spasticity) in the legs. It is caused by mutations in the KIF5A gene, which is involved in the transport of proteins within cells. Symptoms typically begin in childhood or adolescence and may include difficulty walking, muscle spasms, and difficulty with balance and coordination. In some cases, the disorder may also affect the arms and hands. There is currently no cure for SPG58, but physical therapy and medications may help to manage symptoms.