The echocardiographic patterns of the discrete subaortic stenosis are reported. They consist of: narrowing of the left ventricular outflow tract, presence of extra echoes in the septal-aortic passage, abnormal movement of leaflets aortic valve, uniformal thickness of the interventricular septum and posterior ventricular wall. The cross-sectional echocardiography consent to specify the entity, the correct spatial orientation of the stenosis, and to discriminate the discrete membranous type from the fibromuscular diffuse obstruction. The Authors present two cases respectively of subvalvular aortic stenosis of membranous type and fibromuscular type, which are examined by M-mode and cross-sectional echocardiography. Cardiac catheterisation demonstrate, in the first of the cases, also the presence of dinamic obstruction. The specific diagnostic utility of the echocardiography in the investigation of these diseases is confirmed.