. Roentgen interpretation; a manual for students and practitioners . Fig. 43.—Pagets disease. intensive roentgenization. This tumor, which is of slow growth,occurs as an isolated lesion, usually near the end of a long bone orin the jaw. The growth is eccentric, that is, it causes asymmetricalenlargement of the bone and tends to balloon out the cortex rather BONE TUMORS 67 than to spread along the medullary canal. Ordinarily it does notbreak through the cortex. The mass of the tumor consists ofirregular areas of rarefaction containing coarse trabeculae, sometimessuggesting a mass of soap-bubble
. Roentgen interpretation; a manual for students and practitioners . Fig. 43.—Pagets disease. intensive roentgenization. This tumor, which is of slow growth,occurs as an isolated lesion, usually near the end of a long bone orin the jaw. The growth is eccentric, that is, it causes asymmetricalenlargement of the bone and tends to balloon out the cortex rather BONE TUMORS 67 than to spread along the medullary canal. Ordinarily it does notbreak through the cortex. The mass of the tumor consists ofirregular areas of rarefaction containing coarse trabeculae, sometimessuggesting a mass of soap-bubbles, Osteosarcomata are slowly growing masses which usually originatein the medulla of long bones or in the flat bones. Their charac-teristic is an early, extensi^e, irregular deposition of lime saltsthroughout the growth. They are not particularly may be mistaken for an old osteomyelitis but the history willusually differentiate Fig. 44.—Giant-cell sarcoma of the finger. Bound or Spindle-celled (niedvllary) sanomaia are of very rapiddevelopment and metastasize early. They involve the shaft, oftenthe greater part of it. Their appearance is that of extensive rare-faction with destruction of trabeculse, early invasion of the overly-ing cortex and extension into the soft parts. Often there is a com-plete loss of bone substance in the area occupied by the tumor, theoutline of which can be traced into the soft tissue. At times the 68 BONE PATHOLOGY picture resembles that of a virulent osteomyelitis which should bedifferentiated by the history and clinical course. Periosteal sarcomata are rapidly growing tumors which areextremely malignant and which originate from the periosteum,most commonly along the shaft of the long bones. In the earlieststages they may appear as a slight erosion of the cortex or a blister
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