Of all congenital anomalies occurring in children or adults, patent omphalomesenteric duct appears to be one of the rarest. Strasser, in reporting a case of patent omphalomesenteric duct, reviewed the literature and could find only sixty-three such cases reported to 1903. including his own. Of these cases he concluded that fifty-nine were definitely of the patent omphalomesenteric type; the remaining four were doubtful. Of all the cases reviewed by Strasser, in not one was there an associated congenital anomaly. Strasser1 remarked: "Unlike malformations of other parts of gut such as absence of colon and imperforate anus which is usually associated with other anomalies like harelip, cleft palate, spina bifida, exstrophy of the bladder, absence or defect of long bones, congenital dislocations, club feet and genital defects, this condition occurs only in apparently otherwise normally developed children." In the case to be reported this condition occurred associated with an incompletely