The panel members have not had the advantage of previous information about the material which will be presented for their consideration this morning. In each case, I shall present a brief history and show the ordinary chest films. At this point, we will see if the panelists can make the diagnosis. Probably in most instances they will ask for further information, such as special roentgenographic studies, the electrocardiogram, and cardiac catheterization findings. Of course, the moderator knows the answer to each of the diagnostic problems, since the true diagnosis has been determined at operation or perhaps autopsy.
Our first patient is 6 years old. Until one month ago he was not known to have cardiac symptoms. He was admitted to another hospital because of pharyngitis, and at this time a roentgenologic examination of the chest was made. The films showed a very striking configuration of the