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Pure ground-glass opacity, with or without pleural retraction, on chest computed tomography. (A) Adenocarcinoma in situ (AIS) without pleural retraction; (B) AIS with pleural retraction; (C) minimally invasive adenocarcinoma (MIA) without pleural retraction; (D) MIA with pleural retraction; (E) invasive adenocarcinoma (IA) without pleural retraction; (F) IA with pleural retraction.
