Florid Cystic Endosalpingiosis (Müllerianosis) in Pregnancy

Figure 2

Microscopic view of the cystic endosalpingiosis lesions. The hematoxylin-eosin stain (a) showed a histology formed by an external serous layer, a well-organized smooth muscle and an inner layer of tubal cylindrical epithelium with small fibrous stroma papillae, no atypias, and absence of proliferative activity. Although some decidualized cells were present, no endometrial stroma was found. The immunohistochemistry analysis showed a positive expression for estrogen (b) and progesterone receptors, PAX8 (Box-8) (c) and CK7 (d), and a negative expression for CD10, calretinin, and CK20. The proliferative index with Ki67 was below 1%.

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