[Asymptomatic common truncus arteriosus in a 25-year-old patient with paroxysmal tachycardia and truncal valve insufficiency].

We present an adult patient (25-years old), free of symptoms with a congenital heart disease very infrequent and survival to adulthood is exceptional, the truncus arteriosus. Who entered to the Emergency Care Unit because of paroxysmal tachycardia. We describe the case with special reference to echocardiographic findings and we detached the rarity of this congenital heart disease in adulthood.