PMC5509184_01
PMC5509184_02
Multiple cysts lined by a single layer of low cuboidal epithelia are seen. The tumor cells contain atypical hyperchromatic nuclei (hobnail cells). Intraluminal secretion is also seen (hematoxylin and eosin stain, x100)
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F1
Microscopically, the tumors were composed of cysts of varying sizes lined by a single layer of flattened or cuboidal cells with atypical hyperchromatic nuclei with a clear cytoplasm [Figure 1].
Tumor cells with hyperchromatic and pleomorphic nuclei and conspicuous nucleoli are seen (hematoxylin and eosin stain, x400)
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F2
Marked nuclear atypia with pleomorphism and prominent nucleoli was noted [Figure 2].
Benign ectopic endometrial glands can be identified at the arrow (hematoxylin and eosin stain, x40)
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F3
Residual ectopic endometrial glands with stromal cells were observed [Figure 3].