Conclusions ConclusionsDigital and sigmoidoscopic examination and x-ray of the colon and rectum after administration of a barium enema are necessary for thorough evaluation.The danger of missing lesions in the twilight zone situated between the upper limit of the area that can be well seen by sigmoidoscopy and the area that can be visualized efficiently by roentgenography is reemphasized.The value of the Chassard-Lapine projection for solution of this problem is stressed.Repeated roentgenologic studies with attention focused on a local area and progress examinations are often necessary to establish a diagnosis.
© The ASCRS 1960
