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Complex hyperplasia with atypia demonstrated by parallel histology (A), OCTIS images (B and C) and transvaginal ultrasound (D). Luminal epithelium (red arrows), multiple irregular dilated glands (yellow arrows) could be clearly seen in histology and OCTIS images. The endometrial thickness (blue arrows) could be measured on ultrasound. OCTIS = optical coherence tomography imaging system.
