The article describes the essential roentgenologic findings associated with Crohn's disease in the intestine, manifested as stenoses, thickening of the walls, fistula formation and pseudodiverticula or appearance of Bodart's intermediary segment, on the basis of characteristic findings, followed by valuation in respect of the exclusive possibility of diagnosis via radiology. The article goes into details in respect of differential diagnosis criteria, particularly within the frame of tumour diagnosis. Differentiation can be effected with the help of findings in peritoneal carcinosis and intestinal changes induced by radiation.