Fig. 2
From: Triple synchronous primary lung cancer: a case report and review of the literature
a Adenocarcinoma with acinar pattern shows glands with greater architectural complexity and a back-to-back arrangement (hematoxylin and eosin stain, low magnification). b Acinar pattern of adenocarcinoma composed of a gland with a rough oval lumen lined by malignant columnar cells with basal nuclei (hematoxylin and eosin stain, high magnification). c Cytokeratin 7 immunopositivity in the cytoplasm of malignant cells