Turner's syndrome is the only viable monosomy (45, XO). The prevalence amounts to 1: 2'500-5'000. The XO genotype leads to a female phenotype, accompanied by stunted growth and the development of dysfunctional ovaries.

Clinical picture:

• Dysgenesis of the gonads (at birth)
• Retarded growth
• Lymphatic oedema on the backs of the hands and feet
• Wide, shield-shaped thorax
• Wide, webbed neck (pterygium colli)
• Low hairline
• Typical face (sphinx)
• Frequent aortic coarctation, pulmonary stenosis
• Renal abnormalities

Macroscopic image