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AdenoCIS of Lung : Mucinous

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Pulmonary adenocarcinoma-in-situ (AIS) is usually non-mucinous type consisting of mildly atypical type II pneumocytes or Clara cells lining the preexisting alveolar structures in a purely lepidic pattern.

Rare cases of mucinous AIS do occur as shown here. The tumor is composed of well-differentiated tall columnar cells with basally-located small hyperchromatic nuclei. The cells have abundant intracellular mucin and may resemble goblet cells. Nuclear atypia is low-grade. Mucinous AIS must be distinguished from metastases from organs such as pancreas.

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