Clinical and necropsy observations in relatively advanced cases have been the basis for the many theories regarding the development of bronchiectasis. Little has been known about its pathogenesis. No prebronchiectatic conditions have been recognized, and no serial biopsies have been recorded to show the changes from one period to another. Even if advisable, serial biopsies would most likely not reveal a true picture after the first tissue was removed. If, on the other hand, a large series of children with bronchiectasis were found to show a common, almost characteristic appearance in roentgenograms of the chest during the early period of clinical symptoms, a means would be at hand for the recognition of the onset of a bronchiectatic process, possibly before the actual dilatations of the bronchi had occurred. The pathologic changes in the cases that came to necropsy soon after the presence of this sign and subsequent roentgen observations in
ANSPACH WE. ATELECTASIS AND BRONCHIECTASIS IN CHILDREN: A STUDY OF FIFTY CASES PRESENTING A TRIANGULAR SHADOW AT THE BASE OF THE LUNG. Am J Dis Child. 1934;47(5):1011–1050. doi:10.1001/archpedi.1934.01960120069007
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