There are recorded in the literature one hundred and eight cases of Ewing's tumor (endothelial myeloma). To this number, the author adds an atypical case, which has been accepted as an endothelial myeloma by those who have studied it.
These cases are here divided into two separate groups. Group I includes only those concerning which there can be no question as to the correct diagnosis of Ewing's tumor. There are a total of sixty-seven cases in this group. Group II includes forty-two cases which, for various reasons previously stated, are not placed in Group I. These are here classified as probable cases of Ewing's tumor. The case reported in this communication is included among this number because of the atypical features which it presents. While the typical Ewing's tumor presents a characteristic clinical, radiographic, and histological picture, atypical cases are met with occasionally.
In rare instances, when Ewing's tumor begins in the epiphysis of a long bone, it may be difficult to differentiate the condition from tuberculosis of bone.