File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14756727272).jpg

Identifier: americanjournroen06ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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illiampere radiator tube seems to com-pare favorably with the older types de-signed for higher milliamperages. SIGNIFICANCE OF ANNULAR SHADOWS* BY WILLIAM A. EVANS, M.D. DETROIT, MICH. PREVIOUS to last year, it had been ourcustom to interpret all annular shad-ows on chest plates as cavities. In reportingseveral thousand cases during the preced-ing years, we had never questioned that anarea of decreased density surrounded byan area of increased density should beconsidered other than a cavity. Of course,we had recognized pneumothoraces of thelarger type, which were at times clinically which we described as atypical of a cavity,but no suggestion was made that it mightbe a localized pneumothorax. There was asmall amount of fluid present in the cir-cumscribed area, this supporting the viewthat the condition was one of cavity forma-tion. Plates made several weeks later ofthe same case showed a marked diminutionin the size of the supposed cavity andshowed the absence of fluid. This of neces-
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FlG. I. Localized Pneumothorax Opposite theClavicle in the Upper Left. Note diffuse bi-lateral PARENXHYMAL TUBERCULOSIS. and roentgenologically confused with cav-ity formation. We believe that the sameinterpretation of these shadows was madeby other laboratories, because a completereview of the subject and a study of a largenumber of reproductions of chest platesdid not reveal where any reference wasmade to a localized pneumothorax. A review of roentgenograms recentlypublished by Dunham in the Stereo-clinicfailed to show that this question had beendiscussed, and in fact several cases de-scribed as showing cavity formation werein reality cases of localized air pockets.In making a report on a chest examina-tion, last fall, we noted an annular shadow *Read at the Nineteenth Annual Meeting of The Americ.vn Fig. 2. Large Air Pocket in the Upper Left LungField. Note straight line which is definitely INDICATIVE of FLUID. INDISTINCT OUTLINES OF AIRPOCKETS IN THE UPPER RIGHT. sity suggested th

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