Primary carcinoma of the trachea

Abstract
Two cases of primary carcinoma of the trachea are described. Both patients were female and smoked cigarettes for many years. One of the tumors was a squamous cell carcinoma and the other an oat cell carcinoma, the commonest and rarest forms of tracheal cancer, respectively. The diagnosis in the case of oat cell carcinoma was confirmed by EM demonstration of neurosecretory granules, a unique observation at this site. Oat cell carcinoma of the trachea does not appear to have been recorded previously in a female.

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