The establishment of the presence of involved retroperitoneal lymph nodes in cases of known Hodgkin's disease is not attended with too great difficulty, Desjardins, Lenz, and others have stressed the essential symptoms and findings indicating this possibility, as well as the need for early treatment to this area. Cohen was able to show the presence of a retroperitoneal mass in an established case of Hodgkin's disease by the anterior displacement of a calcified abdominal aorta. The aorta resumed its normal position after radiation therapy to the mass. Weyrauch states that enlarged peri-aortic lymph nodes, by pressure upon the region of the hilum of the kidney, will produce vertical torsion of that organ. He cites a case in which the kidney was displaced laterally and its pelvis rotated in ventral position, as a result of metastatic lymph nodes in the peri-aortic region. An instance of such bilateral symmetrical rotation, caused by a large retroperitoneal mass of lymph nodes situated in the mid-line, was reported by Van Zwaluwenburg and Pascucci. Desjardins found that in a great majority of cases in which the peri-aortic lymph nodes are affected by Hodgkin's disease, roentgen examination of the gastro-intestinal tract does not yield any evidence of abnormality. Sometime, however, local abnormality of contour may be found in the stomach or in the small or large intestine. Usually the defect is not constant in outline and is caused by extrinsic pressure. Craver and Herrmann, discussing abdominal lymphogranulomatosis, state that the initial symptom in the extrinsic gastro-intestinal type of the disease is in most cases abdominal pain or epigastric distress, In carrying out a gastro-intestinal roentgen study in 33 patients of this group, these authors noted that in over 50 per cent no abnormality was revealed. Positive roentgen findings were demonstrable in 14 cases, in only 2 of which was displacement of stomach or duodenum manifested. It is in cases presenting an obscure diagnostic problem, where Hodgkin's disease of the retroperitoneal lymph nodes may be a possibility and where the institution of appropriate therapy may be unduly delayed until definite proof of its existence has been obtained, that every aid to the establishment of this diagnosis is most welcome. The following case is presented to illustrate this point. Case Report A white male, aged 54, was admitted to the hospita1 because of weakness, "run-down" condition, and loss of 20 pounds in the past four weeks. The illness had started three months earlier, with a hacking, non-productive cough. Upon visiting a physician, the patient was told that he had a high fever. He had never had pain in the chest or else-where, but he did have night sweats and continuous fever. Recently he had noticed some shortness of breath. There were no gastro-intestinal symptoms. The patient appeared moderately well developed, in no particular discomfort and with no evidence of any great loss of weight.