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Non-invasive Implants, Desmoplastic Type. Implants lie on peritoneal surfaces without evidence of infiltration of the underlying tissue, making it possible to draw a line to separate implant tissue from preexistent tissue (Figures 2, 3 and 6). The implants show a prevalence of stroma vs epithelium (Figures 2 and 5). The appearance of the stroma is desmoplastic, fibroblastic or granulation tissue-like, and it is typically associated with inflammatory cells and recent hemorrhage (Figures 1 and 5). The epithelial component appears as irregular glands, papillae or single cells (Figures 1 and 5) and the cytologic features of the epithelial nests are not overtly malignant (Figure 4). Submitted by Esther Oliva, MD