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Microinvasion: Figures 20-23. The most commonly encountered type of microinvasion is seen in Figures 20-23: isolated cells or small groups of cells, in stroma, with surrounding retraction spaces. Some investigators classify proliferations resembling low grade serous carcinomas, when minute, as microinvasion (Figure 23), but others use the terminology "microinvasive carcinoma". Submitted by Robert A. Soslow, MD