<prompt> Carcinoid syndrome produces valvular disease primarily of theVenous valvesTricuspid valveMitral valveAoic valve  <response>: Answer is B Tricuspid valve; The most common site of involvement is the - Ventricular surface of Tricuspid valve. Cardiac manifestations in carcinoid syndrome are due to fibrosis involving the endocardium, primarily on the right side although left side lesions also occur. Dense fibrous deposits are most commonly on the ventricular aspect of the tricuspid valve and less commonly on the pulmonary valve cusps. They can result in either constriction of valves stenosis or fixation of valves in open regurgitation - Abnormality produced due to tricuspid valve involvement - Tricuspid regurgitation Q - Abnormality produced due to pulmonary valve involvement - Pulmonary stenosis Q 