A high‐grade mucoepidermoid carcinoma associated with giant cell carcinoma of the bronchus was found in a 41‐year‐old man. Light and electron microscopic examinations showed glandular and squamous elements. The histology of the giant cell carcinoma was similar to those of previously reported giant cell carcinomas. It was assumed that the giant cell carcinoma in the present case is the result of transformation of mucoepidermoid carcinoma originating in the bronchial
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