1. Two cases of right-sided aortic arch are reported, one presenting marked symptoms of dysphagia and dyspnoea. 2. Obscure symptoms of dysphagia and dyspnoea should call for a very careful fluoroscopic and radio-logic examination of the chest with barium in the esophagus, in the various positions. 3. Cases of mediastinal tumor or other apparent glandular enlargements not responding to irradiation should arouse the suspicion of the presence of rightsided aortic arch. 4. Hypertension and arteriosclerosis will at times accentuate the symptoms of dysphagia and dyspnoea due to dilation, tortuosity and elongation of the aorta. 5. There are many more of these cases unrecognized and we wish to emphasize the importance of its early recognition.