Figure 5. Photomicrographs (haematoxylin-eosin stain, original magnification (a) x40; (b) x20) show (a) the wall of the cyst composed of fibrous tissue with an inner lining of mature squamous epithelium and respiratory epithelium, and (b) irregular nests of moderately differentiated adenocarcinomatous glands infiltrating the surrounding stroma.

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