Individuals with the 18q deletion syndrome are presented with various clinical characteristics, including cardiac anomalies in 24-36% of the reported cases. Nonetheless, genotype-phenotype correlations for cardiac anomalies in the 18q deletion syndrome have rarely been reported. We report on two girls with a terminal 18q deletion, one in whom an Ebstein anomaly and Wolff-Parkinson-White syndrome were detected and the other with multiple valve stenosis and a ventricular septal defect. The genotype and cardiac abnormalities of these girls and 17 other individuals with a de novo 18qter deletion reported in the literature are reviewed. All 19 individuals shared a small overlapping deletion region between 18q22.3q23. The most common cardiac defects detected were pulmonary valve anomalies and atrial septal defects. Ebstein anomaly, a rare cardiac malformation, was diagnosed in two individuals. Additional molecularly based genotype-phenotype studies are needed in order to pinpoint candidate genes within this region that contribute to normal cardiac development. A careful cardiac evaluation consisting of physical examination, ECG and ultrasound examination should be performed in all individuals diagnosed with the 18q deletion syndrome.