A Case of Ewing's Tumour Treated by X-Ray Treatment

H1sISORCeAI.-IThe classificationi of bone tumours ha(d becn very unsatisfactory il) to the beginninof the last (leca(le. In 1920 Dr. Ewing-, in conju-1nction \vith I)octo-rs (odlmnan and( Blood--'ood, forimle(d a registry of bone sarcomat in America. In 921 this registry w,as a(lopted by tlle American College of Surgeons. The followiiois the classificatioin of bone tuLmoursi; a(dopted(l b the registry (1) Meetastic tumours of boine. (2) Periosteal fibro-sarcoma. (3) Osteogenic tumouris benign and(l malignant. (4) Inflammatory condlitions. (5) Benign giant-cell tumiours. (6) Angiomia-benig,n andil maliginanit. (7) Ewing's tumnour. (8) Mveloma. Exving orig inallv (lescribedl his tumllouLas ani cin(lothelial mvelomia of hone. The histogenesis is, however, by no meanxs settled. (Gesclickter andC(opeland, in their recenit book, state that it is non-osseous in orl-igin ai( possibly arises tfromii the bone lvrmphatics. ('onnor of Harvard h.as recently stated( : 'EIxving's tuimlour hlas brought forth a diversitv of op)inion andI nomenclature that slhows the coifusion Concerning it. It has been (lhassifiedI heretofore as 'a round-cell sarcoma, hut of a different nat ure to the usual osteogenlic sarcoma or mnvelomia.' M\IICROS()CI'ie.-The(CcellS 8 re usual ix rouinI( xvith little ligiht staining cxtoplasmIi. Tl'he art' dclosely packed in se(ct ions oirOxx s ithout definite StruCturL-e. '[he arc hvprchironiatic and max shoxv n umerotis ml itotiC figuires. 'The nucleli are oval or 'omilnl, alnld -ecniaclrl x thie-e is only' oie inucleuis to a cell.