During the past twenty-five years, the double-contrast examination has been a routine procedure in the diagnosis of ileocecal tuberculosis at Eagleville Sanatorium (4, 5). The progress meal and, rarely, enteroclysis (6, 7) are used as supplementary examinations if the double contrast studies fail to disclose intestinal lesions suggested by the clinical picture. Frequently these extra studies are not indicated. Even more often they fail to yield additional positive information. The ileocecal valve is a focal point of particular interest in ileocecal tuberculosis, since most of the lesions are centered about this structure (1). The double-contrast enema always furnishes information relative to the cecal side of the valve. Since reflux filling of the terminal ileum is encountered much less frequently in ileocecal tuberculosis than under normal conditions (3), due to spasm and irritability of the diseased structures, study of the function and pathology of the valve itself can contribute much toward an accurat...