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Cystic atrophic endometrium: cystic atrophic endometrium demonstrated by parallel histology (A), OCTIS images (B and C) and transvaginal ultrasound (D). Luminal epithelium (red arrows), cystic endometrial thickness (area between blue arrows); cystic endometrium (orange arrows) and myometrium (area below green arrow) could be clearly seen in histology and OCTIS images. OCTIS = optical coherence tomography imaging system.
