In comparison with the great number of the various heart conditions, the occurrence of parietal endocarditis is a rare entity. It is a condition that involves the endocardium of the wall of the heart without simultaneous valvulitis.
The oldest account of this condition is by Seitz,1 in 1873, with a description of two cases, both in adults. In 1928, a summary of some of the reports of cases in the literature was given by Torres.2 Zuppinger,3 in 1903, described two cases of endocardial thickening in children; one occurred at the age of 12 years following diphtheria, the other at the age of 10 years, in a tuberculous condition. Fischer4 found the condition at necropsy in a boy of 5 years with congenital syphilis of the heart. Within that decade five other cases were reported, three following diphtheria and two following the opening of superficial ulcers. In