Turner's syndrome is maximally associated with the following cardiac condition:

The most common cardiovascular abnormalities are bicuspid aoic valve, which is present in 10% to 20%, and coarctation of aoa, present in 10% of adult cases. The prevalence of these abnormalities is higher in children. Less common cardiovascular anomalies include, Aoic stenosis Systemic hypeension Mitral valve prolapse Conduction defects Paial anomalous venous drainage Ventricular septal defect (VSD) Ref: Marian A.J., Brugada R., Robes R. (2011). Chapter 82. Cardiovascular Diseases Caused by Genetic Abnormalities. In V. Fuster, R.A. Walsh, R.A. Harrington (Eds), Hurst's The Hea, 13e.