title: Balloon valvuloplasty in an unusually severe case of pulmonic stenosis with direct observation of the valve at subsequent surgery.
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D002312:Cardiomyopathy, Hypertrophic / Q000209:etiology*; D002404:Catheterization / Q000009:adverse effects*; D006801:Humans; D008297:Male; D011662:Pulmonary Subvalvular Stenosis / Q000209:etiology* / Q000601:surgery; D011664:Pulmonary Valve / Q000601:surgery*; D011666:Pulmonary Valve Stenosis / Q000628:therapy*