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Mid-secretory phase endometrium demonstrated by parallel histology (A) and OCTIS images (B and C) and transvaginal ultrasound (D). Luminal epithelium (red arrows) and endometrial glands (yellow arrows) could be seen on OCTIS images. The endometrial thickness measures 12 mm and exceeds the depth of OCTIS. OCTIS = optical coherence tomography imaging system.
