THE CASE presented is one of invagination of the left auricular appendage into the left atrium, discovered at the postmortem examination of an infant 5 months of age who died suddenly after an uneventful recovery from a gastroenteritis. So far as can be determined, such an occurrence has not been reported in the literature.
A 5-month-old infant Latin-American girl was admitted to the hospital with a two-week history of diarrhea which had progressed slowly in severity and subsequently was complicated by severe vomiting. The parents had observed considerable loss of weight. Physical examination revealed a markedly dehydrated infant with a temperature of 99.6 F rectally but showed nothing else of significance. The weight of the child when nude was 8 lb. 4 oz. The family history and the past history were not remarkable. Initial study of peripheral blood showed 12 gm. of hemoglobin (80%); 4,300,000 erythrocytes, and 8400 leucocytes, with