Ovarian Endometrioid Adenocarcinomas With Infiltrative "Adenofibroma-like" Morphology and Aberrant ß-catenin Expression: Tumors That Coexpress CDX2 and LEF1 With Frequent Neuroendocrine Marker Expression, Diminished/Lost PAX8 and Possible Association With Endometrioid Type II Stem Cell Outgrowths in the Fallopian Tube

卵巢子宫内膜样腺癌，具有浸润性“腺纤维瘤样”形态和异常β-catenin表达：肿瘤共表达CDX2和LEF1，并频繁表达神经内分泌标志物，PAX8表达降低/缺失，可能与输卵管内II型子宫内膜样干细胞增生有关。