The Röntgen rays in medical work (1899) (14570312728)

Identifier: rntgenraysinmedi00wals (find matches)

Title: The Röntgen rays in medical work

Year: 1899 (1890s)

Authors: Walsh, David

Subjects: X-rays Radiography X-Rays Radiography

Publisher: London : Baillière, Tindall and Cox

Contributing Library: Francis A. Countway Library of Medicine

Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

Text Appearing Before Image:

ssifica-tion, the areas of the latter beingshown by darker mottlings. Aninteresting point is that theform of the growth is distinctlytraceable where it overlies thedarker phalanx. This lightercolour may be due to its replac-ing the compact phalangealtissue by new spongy bone. Asomewhat similar appearanceis to be found in Fig. 34, whereabsorption of the outer shell ofthe bone has followed the im-pact of a bullet. As alreadyremarked, the record of spongybones, such as the sesamoid, iscomparatively faint in compari-son with that of the medullatedbones, an appearance that maybe due to the relatively lessamount of lime salts present.This difference is well shownin the pelvis, where the sacrum,a light spongy bone, appearsfaint by contrast with the deepshadows of the solid and com-pact iliac bones. Another ob-servation that appears to bearupon this point is that of M.Potain, who recently reported to the Paris Academy of Sciencesthe occurrence of light spots on the radiograms of gouty bones.*

Text Appearing After Image:

Fig. 85.—Ossifying Enchondromaof Finger, of Old Standing :following Injury. Messrs. Allen and Hanbury. * Medical Press and Circular, March 10, 1897, p. 249. MEDICAL AND SURGICAL APPLICATIONS 165 Presumably, the compact tissue is more or less altered at the pointof projection of these tophi. This gouty translucency, if such a term may be applied, wasexplained by M. Potain in the following ingenious and suggestivemanner: The change appears to be due to the substitution ofurates for phosphates of lime. Comparing the different saltswhich enter into the composition of bone, they are found to bedifferently permeable to the Eontgen rays. Phosphate andcarbonate of lime and chloride of sodium are little permeable,soda and magnesia more so, and urate of lime still more. Bymaking use of two cardboard boxes, the one filled with urateof lime and the other with tribasic phosphate, and submittingthem simultaneously to radiography, it is easy to ascertain that theurate of lime is eight times more t

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1899

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