ArticleOxford medical case reports2026
Atypical lung carcinoid with prominent mucinous stroma: unusual pathologic finding in pulmonary carcinoid.
Article in Oxford medical case reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundAtypical carcinoids (ACs) are uncommon neuroendocrine tumors of the lung, and the presence of a prominent mucinous stroma is an exceptionally rare feature that may complicate diagnosis. Highlighting such variants is important for avoiding misclassification with mucin-producing pulmonary tumors. CASE PRESENTATION: A 34-year-old nonsmoking female presented with mild chest pain, minimal cough, and night sweats. Imaging revealed a well-circumscribed right middle-lobe lesion measuring 4.1 cm, and bronchoscopy showed a white-tan, fleshy mass filling the bronchial lumen. PATHOLOGY
findingsHistologic examination demonstrated a well-defined neoplasm with organoid, trabecular, follicular, pseudopapillary, and solid patterns and striking mucinous stromal change. Immunohistochemical staining was positive for CK AE1/AE3, synaptophysin (diffuse), chromogranin (diffuse), and TTF1, and negative for CK7, CK20, and CDX2. Focal necrosis and a mitotic rate of up to 5/2 mm
conclusionThis case represents a rare morphologic variant of AC distinguished by a prominent mucinous stroma, a feature that may obscure the diagnosis by simulating other mucin-producing lung tumors. Recognizing this uncommon pattern is crucial, as it directly impacts diagnostic accuracy and subsequent clinical decision-making.
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