<prompt> Answer this question truthfullyWhat does the term pulmonary valve stenosis mean?  <response>: <reason> Pulmonary valve stenosis is due to a structural changes resulting from thickening and fusion of the pulmonary valve. The valve pathology can be congenital or acquired. The following is the list of causes: .These account for 95 of the cases with pulmonic stenosis which include isolated pulmonic valve pathologies and its associations with other congenital heart diseases. Associated with congenital heart diseaseTetralogy of Fallot Double outlet right ventricle Univentricular atrio-ventricular connection Atrioventricular canal defect Bicuspid pulmonary valve Quadricuspid pulmonary valve: Benign and an incidental finding Isolated pulmonic stenosis Acommissural pulmonary valves: Valve has a prominent systolic doming of the cusps and an eccentric orifice. Dysplastic pulmonary valves: Thickened and deformed cusps with no commissural fusion. It is a common finding associated with Noonan syndrome. Unicommissural pulmonary valve Bicuspid valve with fused commissuresThese are less frequent and account for less than 5 of the cases. Carcinoid Syndrome: most common acquired cause Post infectious: Infective endocarditis Calcification of the pulmonary valve Rheumatic heart disease Ross procedure Functional pulmonic stenosis: Primary cardiac tumors obstructing the right ventricular outflow tract such as leiomyosarcoma. 