Microscopic studies of two cases of keratinized squamous cell carcinoma, several cases of small cell carcinoma and one of adenocarcinoma of the lung are described and illustrated. The authors suggest that pulmonary tumors which are not readily classified by light microscopy might be classified by electron microscopic examination under one of the main groups of bronchogenic carcinoma.
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Obiditsch-Mayer et al. (1968) studied this question.