Certain old medical terms that are all inclusive have been handed down from generation to generation. They are not terms for actual diagnoses under more modern methods of investigation, but are generalizations. Indigestion, rheumatism and other conditions come in this class, and I feel that the term "unresolved pneumonia" could be included in a large majority of cases. While undoubtedly there is such a condition, it is comparatively rare, and the diagnosis of unresolved pneumonia is usually a confession of failure to make a correct one. One has only to view its numerous synonyms commonly used to see how loosely the same condition is variously labeled. Among these may be mentioned: interstitial pneumonia, chronic fibrous pneumonia, organizing pneumonia, protracted pneumonia, persistent pneumonia, delayed resolution and, finally, basal fibrosis. The first three have a distinct pathologic picture which has often been described, and there can be no objection to them when
PICKHARDT OC. UNRESOLVED PNEUMONIA: A SURGICAL ANALYSIS. Arch Surg. 1928;16(1):192–205. doi:10.1001/archsurg.1928.01140010196014
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