“…The others gave rise to increasing (Popp, 1932) or deformed (Beck and Thatcher, 1925) cardiac silhouette on x-ray examination, to metastases (Barnes et al, 1934), or to mitral-valve obstruction (Ravid and Sachs, 1943 ;Abbott et al, 1962). Retrospective pathological studies on primary malignant disease of the heart have shown that 25 out of 100 (Whorton, 1949) and 10 out of 30 (Porter et al, 1961) had pericardial effusion.…”