. A radiographic atlas of the pathologic changes of bones and joints . PLATE XLIV. — 128 — PLATE XLV. CYST OF BONE. Cyst of bones is rarely foiiiul outside of the bones of the head. It isusually the result of a former osteitis. It could not be diagnosed on aradiogram from a small medullary giant cell sarcoma before the latterbreaks through the bony wall. In the Plate a cystic cavity can be seen in the radius about its middlethird. The walls of the cavity are thin and throw a very faint shadow. Theywere formed of periosteum and thin new bone formation. The cavity was tilled with a bloody and se
. A radiographic atlas of the pathologic changes of bones and joints . PLATE XLIV. — 128 — PLATE XLV. CYST OF BONE. Cyst of bones is rarely foiiiul outside of the bones of the head. It isusually the result of a former osteitis. It could not be diagnosed on aradiogram from a small medullary giant cell sarcoma before the latterbreaks through the bony wall. In the Plate a cystic cavity can be seen in the radius about its middlethird. The walls of the cavity are thin and throw a very faint shadow. Theywere formed of periosteum and thin new bone formation. The cavity was tilled with a bloody and serous PLATE XLV. — 130 — DIFFERENTIAL DIAGNOSIS. Of the disease discussed in this part the one which is mostlikely to be confounded with some other disease is osteo-sarcoma;because of that and because of the serious import of such a mis-take, we shall devote a few lines to its differential diagnosis. Asteo-sarcoma must be differentiated from osteo-myelitis, tu-berculosis of bone, syphilis of bone, osteomata, cyst of bone,scurvy and exhubrant callous formations. All cases of osteo-sarcoma seen by the author, with the ex-ception of one case of medullary giant cell sarcoma, presentedthe characteristic frost-like appearance. Large Osteomata: Either exotosis or enostosis are the onlyother diseases of the bone presenting shadows which have anyresemblance to the characteristic appearance of sarcoma. Thisshadow, however, is much denser, does not involve the entire bonesegment and does not merge into the soft parts. Osteomyelitis shows in circumscribed cases the light centralshadow surrounded by
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