. A radiographic atlas of the pathologic changes of bones and joints . PLATE XXIX. PLATE XXX. OSTEO-SAECOMA OF THE LOWER EXn OE THE RAPTlS—CIAXT TELL VARIETY. The characteristic appearance of sarcoma is aljsent. A tumor, encased in a thin bony shell and filled with tissue resemblingthe tubercular granulation tissue, replaces the normal bony shadow ofthe lower end of the radius. The outline of the tumor is distinct, it can be well made out, sepa-rated from the normal soft parts above it by a thin bony wall. The normal inner border of the radius is lost in the new growth. Its articular surf
. A radiographic atlas of the pathologic changes of bones and joints . PLATE XXIX. PLATE XXX. OSTEO-SAECOMA OF THE LOWER EXn OE THE RAPTlS—CIAXT TELL VARIETY. The characteristic appearance of sarcoma is aljsent. A tumor, encased in a thin bony shell and filled with tissue resemblingthe tubercular granulation tissue, replaces the normal bony shadow ofthe lower end of the radius. The outline of the tumor is distinct, it can be well made out, sepa-rated from the normal soft parts above it by a thin bony wall. The normal inner border of the radius is lost in the new growth. Its articular surface remains PLATE XXX. •91 — SYPHILIS. Distinguised on the radiogram by the darker hue of boneand the thickened and irregular outline of the periostal cover-ing, due to the condensing osteitis in and on the surface of thebone and the deposit of new bone under the periosteum. Thedisease usually commences in the periosteum, which becomesthickened and infiltrated (Plate XXXII), with or without theformation of the bony matter. As the disease progresses, thechannels in the bone, enlarged by a rarefying osteitis, formingirregular defects, are filled with new fibrous tissue (PlatesXXXIII, XXXIV). The process is not infrequently associatedwith suppuration (Plate XXXV, and the necrosis of a largeror smaller portion of bone (Plate XXXVI). — 92 — PLATE XXXI. SYPHILITIC GUIIMATA OF THE JIUSCLES OF THE THIGH. The shadow seen in the muscles of the anterior surface of the thigh isa mass of sclerotic tissue of s\-philitic origin.
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