. Medical diagnosis for the student and practitioner. Fig. 125.—Interlobar empyema (right) with infiltration of left lung, closely simulatingthat of tuberculosis. {Dr. Frank S. Bissell.) toward the hilus. The anatomical explanation of the cone is that eachprimary lung lobule (the anatomical unit) is triangular or cone-shaped andhas its own complement of blood and lymph vessels. Since, however, it is not always possible, even in known cases of tubercu-losis to clearly delineate the cone it becomes necessary to rely upon less 316 MEDICAL DIAGNOSIS typical areas of increased density, pointing to
. Medical diagnosis for the student and practitioner. Fig. 125.—Interlobar empyema (right) with infiltration of left lung, closely simulatingthat of tuberculosis. {Dr. Frank S. Bissell.) toward the hilus. The anatomical explanation of the cone is that eachprimary lung lobule (the anatomical unit) is triangular or cone-shaped andhas its own complement of blood and lymph vessels. Since, however, it is not always possible, even in known cases of tubercu-losis to clearly delineate the cone it becomes necessary to rely upon less 316 MEDICAL DIAGNOSIS typical areas of increased density, pointing to congestion or beginning infiltra-tion in the periphery of the lung field. The more characteristic site of suchareas is that beyond the extremities of the first and second interspace bron-chial trunks. It is fortunate for differential diagnosis that these areas usually. Fig. 126.—Unilateral Pulmonary Tuberculosis. Note marked infiltration of rightupper lung field. Pleuro-diaphragmatic adhesions. {Dr. Frank S. Bissell.) remain clear and uninvolved until late in the progress of other chronicinfections. Basal tuberculosis, while it has the same general characteristics, is muchmore difficult to differentiate from other chronic infections. Tuberculosis ROENTGENOGRAPHS EXAMINATION OF LUNGS AND PLEURAE 317 of the base, however, without concomitant involvement of the apex of one ormore lobes, is relatively rare. Advanced Tuberculosis.—Paradoxical as it may seem, the more advancedstages of tuberculosis sometimes present a roentgen picture less typicaland hence less easv to differentiate than the earlier ones.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1922
