Seven patients with prolapsed posterior mitral leaflet were identified in whom the clinical findings were suggestive of aortic stenosis. In each instance, the murmur was best appreciated at the parasternal area. The murmur radiated to the carotids in two patients. Spatial mapping with pulsed-wave Doppler as well as continuous-wave Doppler examination demonstrated the presence of mitral regurgitation and also that the regurgitant stream was directed to the anterior left atrial wall near the base of the aorta.