Identifier: americanjournroen05ameruoft (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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
rs. It may be spherical orthe usual oval may be greatly exaggerated.Instead of rounded ends, these may bepointed. The central portion of the headmay show marked rarefaction, a findingwhich has been observed only in the largerbulbous types. Varying degrees of calcifi-cation may be found, which here as else-where in pulmonary structures may betaken as an index of chronicity. Variationsin the tail are less marked but differencein thickness and density are observable. From this analysis we would concludethat the inverted comma is a sign of tuber-culosis ; that it is a sign of a chronic, rarelyan acute process; and that it signifies apast rather than a present infection. In the23 per cent which were found in activecases of tuberculosis, the comma is pos-sibly evidence of a previous infection. Much remains to be answered. Is thecomma evidence of a lymphogenous, anhemic, or an inspiratory origin of tuber-culosis? If the latter, then is it evidence ofa bronchial tuberculosis? Is it the result
Text Appearing After Image:
Fig. 4. Showing Inverted Comma.Consolidation in left upper third showing cavity Inverted Comma Sign 127 : infection by the tubercle bacillus onlyr may it result from other types of in-action? )May it result from inorganic de-losits as in pneumoconiosis? Why is itith rare exceptions found only on the rightide? Is the comma when once present(ermanent, or may it be absorbed if notalcified? Why is it not present in all cases;f pulmonary tuberculosis? Is this signjapable of practical application in .v-ra)liagnostics? What is the comma, is a question to bedecided by postmortem and pathological;tudy. While at the Cincinnati meeting of:he western section, following my commu-lication on the comma, Dr. Kennon Dun-lam took several of the members to theI^ity Tuberculosis Hospital where he hadnany lungs, preserved entire in large jars.ie had stereoroentgenograms of themnade after their removal postmortem. He;elected one showing the comma sign and;hen dissected the lung to find the comma,t was read

Note About Images