Pili torti is a hair shaft abnormality characterized by flat hair that is twisted at irregular intervals. Hair is normal at birth but progressively stops growing long and becomes fragile. Pili torti can be isolated or occur in association with syndromes such as Menkes disease or Bazex syndrome. The disease is pili torti (Monarch Disease Ontology id MONDO_0009870). Also known as: pili torti (disease), twisted hair.