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[Complex congenital heart disease in adult complicated by endocarditis. Diagnostic difficulties].

We describe a case of a 45-year-old man admitted with symptoms of infective endocarditis on tricuspid valve. At this time complex congenital heart disease was first time diagnosed. Differential diagnosis between tetralogy of Fallot and double-chambered right ventricle is discussed. At surgical exploration tetralogy of Fallot was confirmed. The patient underwent successful total surgical correction.