The tricuspid valve (TV) apparatus consists of three leaflets: a large anterior leaflet, a septal leaflet, and a smaller posterior leaflet. Tricuspid stenosis (TS) is a relatively uncommon valvular lesion in North America and Western Europe. Unlike TS, tricuspid regurgitation (TR) is common and can be primary or secondary to annular dilation. Right-sided valvular heart disease occurs frequently in patients with carcinoid syndrome, but left-sided involvement, pericardial effusion, and myocardial metastases may also occur. The pulmonary valve (PV) is a trileaflet semilunar valve with an anterior, a left, and a right leaflet, and is similar to the aortic valve in basic structure and function. The pulmonary artery (PA) trunk is approximatively 4-5 cm long and 2-3 cm wide in normal adults. Severe pulmonary regurgitation (PR) is usually caused by dilation of the PA and PV annulus, for example as a result of acute or chronic pulmonary hypertension.