Case 6 possessing EIC confined to endometrial polyp (A. Pap × 20, B. Pap × 60, C. HE × 60, D. HE × 60). A. Large-sized carcinoma cell clusters are accompanied by a non-necroinflammatory background. B. Carcinoma cells mainly appear in a flat and sheet-like cluster. The nucleus has an enlarged eosinophilic nucleolus. C. The atypical glands are normal-sized, accompanied by cystic dilatation of atrophic normal glands. D. Carcinoma cells are replacing pre-existing glands and are arranged in a single layer (compare with normal gland marked by an arrow).
Yasuda et al. Diagnostic Pathology 2013 8:25 doi:10.1186/1746-1596-8-25