EWING'S TUMOR (PRIMARY INTRACORTICAL AND SUBPERIOSTEAL LYMPHANGIO-ENDOTHELIOMA)

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Abstract
Whoever studies the subject of endothelioma of the bones and endothelial tumors in general cannot fail to be struck by the great confusion in terminology and classification which exists in this field. Unfortunately, the group of the endotheliomas has become a conglomerate composed of many tumors of unusual appearance and histology. Since the morphology of endothelial tumors is, in general, far less distinctive than is that of epithelial tumors, it is not unnatural that the pathologist confronted with microscopic sections of an unusual tumor which resembles neither carcinoma nor sarcoma should choose the middle ground and make a diagnosis of endothelioma. Although Ewing1 was not the first to describe endothelial tumors of bone, he was the first to present a large series of cases, and, what is even more important, it was he who separated these growths into a fairly distinct clinical and roentgenologic group. Previously, the literature on

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