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Proliferative phase endometrium demonstrated by parallel histology (A) and OCTIS images (B and C) and transvaginal ultrasound (D). Luminal epithelium (red arrows), functional endometrial thickness (area between blue arrows), myometrium (area below green arrow) and endometrial glands (yellow arrows) could be observed on OCTIS images. OCTIS = optical coherence tomography imaging system.
