What is Ulnar–mammary syndrome?

Ulnar–mammary syndrome or Schinzel syndrome is a cutaneous condition characterized by nipple and breast hypoplasia or aplasia. Features of UMS can be mild to severe and can vary significantly from person to person, even within the same family. The main features of UMS include upper limb defects , underdevelopment of the apocrine and mammary glands , and various genital abnormalities. Other signs and symptoms may include hormonal deficiencies, delayed puberty , dental problems and obesity. People with UMS may have distinct facial features, including a wide face tapering to a prominent chin, and a broad nose.