For the purpose of this paper, a foreign body is one of long sojourn after it has been present in the air passages for two months or more and up to as many as thirty-five years, except that in one or two instances the sojourn has been less than two months but the pathologic changes are unusual. Serious pathologic changes do occur at times in cases of much shorter duration, but these are more or less constantly the acute type, such as infection, emphysema or atelectasis, with which physicians are quite familiar.
We find in cases of long sojourn a most remarkable variation as to the extent of the lesion and also as to its stage of development at any given period of time, but practically all of the chronic changes are the result of infection and defective drainage. In 1917, Jackson 1 described pathologic changes as seen through the
MANGES WF. PATHOLOGIC CHANGES IN LUNG TISSUE: AS THE RESULT OF FOREIGN BODIES OF LONG SOJOURN. JAMA. 1926;87(13):987–991. doi:10.1001/jama.1926.02680130001001
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