PMC4356052_01
Small tracheal lesion seen on computer tomography imaging of the chest.
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Imaging findings prompted diagnostic bronchoscopy, which was unremarkable except for an incidental 0.7 cm tracheal nodule (Fig. 1).
Epithelial-myoepithelial lesion seen on pathology (H + E stain, 2x magnification).
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The nodule was sampled and pathology demonstrated a tumor composed of glands with a double layer of lining cells (Fig. 2).
High resolution view with smooth muscle actin staining (10x magnification).
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The outer layer was composed of clear cells, immunoreactive to smooth muscle actin and p63 (Fig. 3).