PNEUMATOSIS cystoides intestinalis, also known as gas cysts of the intestine, is considered to be a rare pathological condition. Bang,1 in 1876, first published a report of its occurrence in a human being, and it has been recognized to occur in swine for a number of years, usually associated with a catarrhal enteritis. There have been fewer than 50 cases recorded in the American literature, the most recent being reported by Appleby2 and also by Sherwin and Messe.3 Finney,4 in 1908, reported the first American case. Jackson,5 in 1940, presented the 4th case in this country, bringing the total number of recorded cases to 172 at that time. The condition is rarely diagnosed before operation. Reverdin,6 in 1924, diagnosed the first case confirmed by surgery. In 1949 the first American case was diagnosed by x-ray study, preoperatively, by Gazin, Brooke, Lerner, and Price.7