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Non-invasive, Epithelial Implants. Well-defined, frequently rounded proliferations of free floating nests and/or papillary structures that are surrounded by reactive mesothelium (Figures 1-5). There is only mild to moderate cytologic atypia consistent with that seen in a borderline tumor (Figures 2,3 and 5 ). Notice that there is no destruction of the underlying tissue or associated stromal proliferation. Submitted by Esther Oliva, MD