A rare, complex subtype of hereditary spastic paraplegia that presents in infancy with delayed motor development (i.e. crawling, walking) and is characterized by lower limb spasticity, increased deep tendon reflexes, extensor plantar responses, impaired vibratory sensation at ankles, amyotrophy and borderline intellectual disability. Additional signs may include gait disturbances, Achilles tendon contractures, scoliosis and cerebellar abnormalities. The disease is Monarch Disease Ontology term MONDO_0018422 (autosomal recessive spastic paraplegia type 70). Also known as: SPG70, spastic paraplegia 70, autosomal recessive.