. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 31. Section through cartilaginous wall and in-- flammatory lining to cavity in epiphysis of headof femur in Perthes disease, a—Necrotic —Sequestrum, c—Layer of granulations, d—Fi-brous layer, e—Wall of cartilage. mon to obtain negative cultures in cases oflocalized osteomyelitis of several monthsstanding. Congenital Jenoiis Aneurysm.—Figure 32shows the roentgenologic appearance ofthe enlarged right upper extremity of aneighteen-year-old boy, produced by congen-. FiG. 32. Congenital venous aneurysm of
. The American journal of roentgenology, radium therapy and nuclear medicine . Fig. 31. Section through cartilaginous wall and in-- flammatory lining to cavity in epiphysis of headof femur in Perthes disease, a—Necrotic —Sequestrum, c—Layer of granulations, d—Fi-brous layer, e—Wall of cartilage. mon to obtain negative cultures in cases oflocalized osteomyelitis of several monthsstanding. Congenital Jenoiis Aneurysm.—Figure 32shows the roentgenologic appearance ofthe enlarged right upper extremity of aneighteen-year-old boy, produced by congen-. FiG. 32. Congenital venous aneurysm of the upperextremity with marked osteoporosis of radius andulna and circular shadows cast by phleboliths. ital venous aneurysm. The circular shadows,many of which are laminated, are producedby phleboliths that formed in the thrombi ofthe dilated vein. The humerus is littlechanged but the radius and ulna, in the re-gion of which the varicosities are mostmarked, show extensive osteoporosis withlongitudinal streaking and slight reduction indiameter. The cause of the osteoporosis isproblematic. It is not due to disuse, as thefunction of the arm was not greatly im-paired, and the humerus, which should be Studies in Reduction of Bone Density 371 affected if this were the case, is practicallyfree. It may be due to the venous congestionand consequent acidosis from an increase ofthe CO2 content of the blood. This wouldaugment the solubility of the lime salts andfavor absorption. Similar osteoporosis hasbeen observed in cases of enlargement of anextremity fr
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