The endometrial-like glands and stromal cells were found under the bronchial epithelium (A). The ectopic glandular structures surrounded by a densely distributed endometrial-like stroma, and the glands predominantly showed a single layer of columnar cells similar to the endometrial epithelial lining with basal nuclei, and no marked cytological atypia could be observed (B). A, HE×100; B, HE×200.
Yu et al. Diagnostic Pathology 2013 8:53 doi:10.1186/1746-1596-8-53