File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14756545552).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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lop-ment of organisms, and before long theinfection spreads rapidly throughout theinflamed area. Now by means of punctur- ing the drum-membrane the outside posi-tive pressure is reestablished. As a resultthe venous engorgement is reduced, andthe conditions favorable to infection aregradually removed. Generally this healingprocess is spoken of as a matter of drainage.If we consider, however, the arrangementof the cells, we can see that simple mechan-ical drainage does not explain the process.The theory of reestablishment of positiveatmospheric pressure, instead of the nega-tive pressure which is present during theinfection, seems a very plausible one. Ver\^often simple repeated paracentesis willbring about a cure in this type of mastoideven though the clinical symptoms mayhave been marked. The second pneumatic type is a combi-nation of pneumatic and infantile types,with the pneumatic character predominat-ing. This is the type in which the mastoidmass originally contained a large amount
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Fig. 12. Photograph of a temporal bone, showing a nest of large diploetic cells in the tip, separated from thepneumatic structure by a layer of compact bone. This is Type 2 pneumatic mastoid. Comparewith Fig. 13. Some Obser\ations of Mastoid Structure

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