. Archives of physical medicine and rehabilitation . normal soft parts, an unthickened peri-osteum, and this periosteum strips backsometimes exactly like normal perios-teum, in other cases it seems looser. 1 hebone beneath may be normal, that in,white and opaque, and when the peri-osteum is stripped back from eachHaversian canal into which the con-nective tissue of the periosteum dips,a minute drop of blood will first change from normal in thebone shell is that this bleeding fromthe Haversian canals is absent, and thebone beneath has lost its white, glisten-ing, opaque appearance an
. Archives of physical medicine and rehabilitation . normal soft parts, an unthickened peri-osteum, and this periosteum strips backsometimes exactly like normal perios-teum, in other cases it seems looser. 1 hebone beneath may be normal, that in,white and opaque, and when the peri-osteum is stripped back from eachHaversian canal into which the con-nective tissue of the periosteum dips,a minute drop of blood will first change from normal in thebone shell is that this bleeding fromthe Haversian canals is absent, and thebone beneath has lost its white, glisten-ing, opaque appearance and is dark,somewhat like the bark of a tree. The thickness of the bone shell mayvary up to the thinness of one palpates the bone shell itmay feel like normal bone, it may beslightly rough, or it may give parchmentcrepitation. In the Journal of Radiologyfor March, 1920, I discussed and il-lustrated the types of central that article. Figure 1 (Pathol. ) shows the x-ray of a centralmy.\osarcoma, while Figure 2 ( Pig-. 1—Pathol. No. 30616. Case (6 9 22) of periosteal sar-coma of the ossifyiugf type. Thisbony tumor palpates like bone. Pig-. 2—Pathol. No. 30616. Case (9 5 22) of periosteal sar-coma of ossifying- type. This bonytumor iialpates like bone. 119 No. 17871) shows a benign cyst ofthe greater trochanter. Figure 5(Pathol. No. 16297) is a of the upper end of the tibia; Fig-ure 15 (Pathol. No. 22016) a cen-tral chondroma of the lower end of thefemur, and Figure 16 (Pathol. ) a central giant-cell tumor ofthe lower end of the femur, while Fig-ure 20 (Pathol. No. 14229) is a cen-tral sarcoma; Figure 28 (Pathol. ) a central myxoma: Figure 37(Pathol. No. 23552) illustrates thaituberculosis may appear as a centralbone lesion with an intact bone to the present time I have neverobserved syphilis or pyogenic osteomye-litis to appear as a central bone lesionwith an intact bone shell with
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