Left-sided tricuspid atresia with situs solitus and l-loop is an extremely rare congenital anomaly that presents clinical features identical to mitral atresia and requires careful angiocardiographic differentiation.
Angiocardiography enables differentiation of rare left-sided tricuspid atresia from mitral atresia; extends sparse case literature on this anomaly.
Two cases of extremely rare type of tricuspid atresia are presented. Both possessed left-sided tricuspid atresia, situs solitus of viscera and atria, 1-bulboventricular loop and 1-transposition of the great arteries. These anomalies are typical tricuspid atresia with 1-transpositions. The importance of bulboventricular loop in tricuspid atresia is emphasized because the atretic tricuspid valve is right-sided in the heart with solitus and d-loop, and is left-sided in the heart with solitus and 1-loop.
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Sato et al. (1976) studied this question.
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