This case demonstrates the x-ray appearance of a right-sided subpulmonic pleural effusion. There is an apparent elevation of the right hemidiaphragm. The apex of this pseudohemidiaphragm is displaced laterally, and this suggests a subpulmonic effusion as the diagnosis rather than a true raised hemidiaphragm1. Subsequent CT demonstrates a pleural effusion which is posteriorly located with the patient supine.
*Thanks to Dr Brad Davis for his input on this case.