Identifier: americanjournroen08ameruoft (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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f tuberculosis. It is acharacteristic of a limited lung lesion. It isdependent upon the septa of the lung whichare arranged so as to divide the lung intonumerous cones or triangular pyramids.These limit the extent of many lung lesionsas effectively as the lobe limits lobar pneu- X-Ray Examination of the Chest 435 monia. They form the secondan- lobules ofthe lung. When a lesion with differentiatingdensity develops within one or a number ofsecondary lobules it may be recognized uponthe plate. Such lesions are found in lobularpneumonia, pneumonoconiosis, infarct andtuberculosis. The pathognomonic tuberculouslesion is found w4ien we have two or more the bronchus. The septa are prolongations ofthe pleura into the lung and they prevent thespread of the lesion beyond their boundariesbecause they carry the lymph flow awayfrom the adjacent lobules, and barring cavi-tation the tubercle does not pass over thisboundary. The lesion may invade the adjoin-ing lobule, but it does not pass through the
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Fig. 8. No. 1075.—Adult type of tuberculosis showingdefinite open active apical fans involving ver-tebral first interspace trunk of upper right andsecond interspace trunk of upper left. A. Right vertebral trunk. B. Right first interspace trtmk. C. Right second interspace trunk. D. Left second interspace trunk. of these fans of differing density (Fig. 9).These densities may vary from a coarse in-terweaving to a faint cloud, to fine or coarsestudding or to a complete blotting out of thelung structure. In advanced lesions the nov-ice is unable to make out the fans, but theycan usually be seen if the plates are carefullystudied. Usually tuberculous fans form firstin the upper part of the upper lobes. I believe that I can amplify this truth if Idigress and explain why tuberculous fans areof differing densities, how and why they dif-fer from some other lesions and emphasizethat primarily they are small and lie close tothe periphery. The early adult lesion is small because tu-berculosis sp

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