Wiedemann-Steiner syndrome is a rare genetic condition characterized by distinctive facial features, hairy elbows, short stature, and intellectual disability. This condition is caused by changes (mutations) in the KMT2A gene (also known as the MLL gene). It is inherited in an autosomal dominant manner. Most cases result from new (de novo) mutations that occur only in an egg or sperm cell, or just after conception. Treatment is symptomatic and supportive and may include special education classes and speech and occupational therapies aimed at increasing motor functioning and language. The disease is Wiedemann-Steiner syndrome (MONDO_0011518). Also known as: hypertrichosis-short stature-facial dysmorphism-developmental delay syndrome.