. A radiographic atlas of the pathologic changes of bones and joints . PLATE XXIIl. — 74 — PLATE XXIV. OSTEITIS OF THE TIBIA. Below the epiphyseal line, on the anterior and inner surfaces of the tibia,is the light shadow of bone rarefaction. The extent of the bone involvement and the loss of bony substance canbe plainly seen. The darker shadow of the soft parts to the inner side of the tibia showsthe secondary involvement of these parts and the presence of PLATE XXIV. — 77 — SARCOMA. Osteo-Sarcoma is recognized on the radiogram by a shadowusually paler than tha
. A radiographic atlas of the pathologic changes of bones and joints . PLATE XXIIl. — 74 — PLATE XXIV. OSTEITIS OF THE TIBIA. Below the epiphyseal line, on the anterior and inner surfaces of the tibia,is the light shadow of bone rarefaction. The extent of the bone involvement and the loss of bony substance canbe plainly seen. The darker shadow of the soft parts to the inner side of the tibia showsthe secondary involvement of these parts and the presence of PLATE XXIV. — 77 — SARCOMA. Osteo-Sarcoma is recognized on the radiogram by a shadowusually paler than that of normal bone and resembling in appear-ance that of zvkite paint frosted on a pane of glass by means ofa piece of absorbent cotton. This appearance is regarded as char-acteristic by the author. It is due to the fact that on account ofthe degenerative changes as well as from the hemorrhagic extra-vasation, larger or smaller cystic cavities develop and the extra-vasated blood causes areas of pigmentation. Besides this, insome types of the disease, new bone formation takes place in themass in the shape of small calcified plates surrounded by a softerzone. The disease starts in the bone or in the periosteum and mayeven start from the outside layers of the periosteum, involvingthe soft parts, itself remaining intact between the bone and thegrowth (Plate XXA). Most frequently a new bone is formedbeneath the periosteum, so that the tumor is encased in a thinbony shell (Plates XXVI
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