It is only within recent years that calcification of the pericardium has been of any particular clinical interest. For many years it existed mainly as a pathologic curiosity, insusceptible to diagnosis during life, and discoverable only during a postmortem examination. Because of these circumstances, interest in this condition was centered largely about its morbid anatomy. Therefore, in spite of several studies of this condition, especially those of Diemer,1 Jones2 and Müller,3 there has existed no general agreement as to its etiology, clinical significance or its relation to the other pathologic processes frequently associated with it, particularly its relation to changes in the other serous cavities and in the liver.
The advent of the roentgen ray and the improvement in its use has changed these circumstances. Following the suggestion of Diemer1 in 1889 and of Simmonds4 in 1908, that these cases might be discovered during life