PMC3834989_01
Computerized tomography (CT) of the chest showing a mass (arrow) measuring 1.5-2 cm obstructing the right upper bronchus with associated atelectasis. No evidence of metastatic disease is seen. (a) Mediastinal window. (b) Lung window.
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fig1
Computerized tomography (CT) of the chest showed a mass involving the right upper lobe bronchus with associated atelectasis (Figures 1(a) and 1(b)).
(a) Bronchoscopic image showing a smooth, well-circumscribed endobronchial tumor (arrow) at the orifice of the right upper lobe bronchus. (b) Low power (20x) microscopic image showing a polypoid endobronchial mass extending into the bronchial lumen (arrow) and superficially invading the submucosa. (c) Tumor is comprised of glands, tubules, and cysts containing mucin (arrow) separated by a fibrous stroma (100x). (d) Higher power (400x) microscopic image showing a mixture of mucin-secreting cells (arrow) admixed with sheets of squamoid and intermediate cells (arrowhead) intimately admixed with the glandular component. The cells lack significant mitotic activity, nuclear pleomorphism, and cellular necrosis characteristic of a low-grade mucoepidermoid carcinoma.
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fig2
Bronchoscopy was performed and demonstrated a smooth, well-circumscribed tumor at the right upper lobe orifice (Figure 2(a)) that was presumed to be a carcinoid; however, a biopsy of the mass was nondiagnostic. Microscopic examination revealed a low-grade mucoepidermoid carcinoma (Figures 2(b)-2(d)).