“…Since Sames (1949) described partial atresia of the pyloric antrum due to a mucosal diaphragm, over 50 similar cases have been described (Sloop and Montague, 1967;McBee and North, 1970;Javier-Gabriel, 1976). The true incidence of this condition is difficult to assess because of differences in nomenclature (Schwartz et al, 1977), variations in classification and the wide age distribution.…”