Case Report
Florid Mesothelial Hyperplasia Associated with Abdominal Wall Endometriosis Mimicking Invasive Carcinoma
Figure 1
Scanning magnification shows groups of endometriotic glands surrounded by light gray staining stroma that is pseudodecidualized due to progestin treatment. Adjacent is a focus of tubular structures and nests with a pseudoinfiltrative growth pattern (arrowheads) (a, 20x). At intermediate magnification cells form tubular structures and nests with angular pseudoinfiltrative shapes, some surrounded by slit-like spaces set in dense collagenous stroma. The endometriotic gland in the upper right corner is surrounded by pseudodecidualized stroma (b, 100x). High magnification reveals the pseudoinfiltrative growth pattern of tubular structures and nests. Cells have relatively scant eosinophilic cytoplasm and round to oval monotonous nuclei, with some nuclear overlap. Chromatin is finely distributed, and occasional small nucleoli are seen (c, d; 400x).
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