Fig. 2From: Well-differentiated fetal adenocarcinoma of the lung: positron emission tomography features and diagnostic difficulties in frozen section analysis—a case reportMicroscopic examination of the surgical resection specimen. a Hematoxylin and eosin-stained section showed glands comprising single or double layers of nonciliated cells and some morule formations (red arrowhead). b Immunohistochemical examination showed a positive result for β-cateninBack to article page