Our purpose in this paper is to report a case of mesenteric cyst, which, judging from the current literature, is a relatively infrequent condition and, from the textbooks, nonexistent; also to advance a possible explanation for the condition in a case in which the usual pathologic changes did not exist.
J. T., a boy, aged 3 years, seen, Aug. 29, 1932, had always been in good health until three months before he came to us. His family and birth histories were negative. He weighed 8½ pounds (3,855 Gm.) at birth; he walked at 9 months; he was breast fed for three months and then fed whole cow's milk formula. His parents had noticed a left sided hernia since he was 1 month old. He had had none of the contagious diseases of childhood. His parents stated that the hernia had been small and reducible until three months before we saw