SITUS inversus is a relatively rare condition but one which presents a number of practical considerations to the surgeon. Blegen reports that in mass chest x-ray surveys this anomaly will probably be found once in every 6000 to 8000 persons.1 In United States Army recruits the incidence was 1 in 35,000.8 Tanner-Cain and Crump reported an incidence of 1 in 17,000.8 There are probably more than 15,000 persons in the United States with this situation.3 The transposition is not total in all instances, but may be limited to the thoracic or the abdominal viscera. Partial situs inversus is far more infrequent than the total variety, and surgical abdominal problems may present a greater diagnostic challenge when the heart is in the left hemithorax.
Situs inversus is of clinical significance because other congenital anomalies are commoner with visceral transposition than in the general population and because of
SEIDENBERG B, HURWITT ES. SITUS INVERSUS ABDOMINALIS AND CHRONIC CALCULOUS CHOLECYSTITIS. AMA Arch Surg. 1956;73(6):1055-1057. doi:10.1001/archsurg.1956.01280060155034