The relation of trauma to neoplastic growth has always excited interest and is unquestionably of importance. Certain portions of the body are subject to trauma more than others, and tumors occurring in these areas are often considered to result from such injury. Common examples of such tumors are those arising from bone, carcinomas of the breast and angiomas of the scalp, face and extremities. The degree of trauma and the length of time between it and the occurrence of the neoplasm vary greatly. Since the manner in which an injury may initiate true tumor growth is not understood, it is difficult to judge the significance of the trauma. It seems reasonable to suppose, however, that this significance may be greater when a fairly severe injury is followed within a short period of time by a neoplastic growth. This condition seems to be fulfilled by the case which we shall describe. The major portion of the literature concerning tumors arising from blood and lymph vessels is confusing, because no uniform method of