AbstractNineteen cases of dystrophia myotonica have been surveyed radiologically. The post-mortem findings in one case and in the infant child of another are presented.Abnormalities were found in the gastro-intestinal tract of 13 out of 18 cases investigated.The commonest changes were in the oesophagus, which showed poor peristalsis and well-marked dilatation, with pooling of barium in the pharynx.Two cases had a barium enema examination. In one of these the colon was atonic with a deficient haustral pattern throughout the bowel.Basal atelectasis with elevation of the diaphragm was present in nine cases.The skull radiographs of 11 patients showed some or all the following features: hyperostosis; thick posterior clinoid processes; ossification of the diaphragma sella; poor mandibular angle; large frontal sinuses.