Autosomal dominant congenital benign spinal muscular atrophy is a rare distal hereditary motor neuropathy, with a variable clinical phenotype, typically characterized by congenital, non-progressive, predominantly distal, lower limb muscle weakness and atrophy and congenital (or early-onset) flexion contractures of the hip, knee and ankle joints. Reduced or absent lower limb deep tendon reflexes, skeletal anomalies (bilateral talipes equinovarus, scoliosis, kyphoscoliosis, lumbar hyperlordisis), late ambulation, waddling gait, joint hyperlaxity and/or bladder and bowel dysfunction are usually also associated. The disease is MONDO_0010839 (neuronopathy, distal hereditary motor, autosomal dominant 8). Also known as: autosomal dominant benign distal spinal muscular atrophy, autosomal dominant congenital benign spinal muscular atrophy, congenital benign spinal muscular atrophy with contractures, congenital nonprogressive spinal muscular atrophy.