Abstract
Myoepithelial tumors occur mainly in the salivary glands, the sweat glands or the breast, but uncommonly in the lung. Herein, we describe two cases of myoepithelioma of the lung. Both patients were 58-year-old men, in whom the tumors were located in the right-upper bronchus and in the left-upper bronchus, respectively, with endobronchial growth pattern. Surgery was performed, but metastasis occurred into the forearm and hip muscles in the former case, and into the liver in the latter. Histologically, the tumor in the former was a spindle-plasmacytoid type, and that in the latter was a plasmacytoid type in part with squamous differentiation. Based on histochemical, immunohistochemical and ultrastructual analyses, both were compatible with myoepithelioma. The clinicopathological uniqueness of this neoplasm is discussed, together with a review of reports of this disease in the literature.
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