Right-sided endocarditis and ventricular septal defect.

Right-sided endocarditis occurred in a 40-year-old woman with ventricular septal defect. This association is uncommon in adults. Because of the changing and variable clinical patterns of this disease, it is difficult to make a prompt diagnosis. In this case diagnosis was delayed for almost a year. The occurrence of pneumonia due to Streptococcus viridans was the most important extracardiac manifestation.