Figure 2. Acinar pattern in lung adenocarcinoma.
(A) Simple tumor glands of tumor cells with mild nuclear atypia and desmoplastic stroma. (B) Simple tumor glands of tumor cells with moderate nuclear atypia. (C) Large, simple tumor glands with clear cytoplasm and intraglandular mucin. (D) Crowded glands mixed with simple and some complex glandular spaces but having intervening stroma in most areas between glandular spaces.