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Validation of ultrasound dimension measurements by light microscopy. (A-D) Ultrasound images of an embryo at E14.5 illustrating measurement locations for crown-rump length (CRL), biparietal diameter (BPD), abdominal anteroposterior diameter (APD), abdominal transverse diameter (ATD), placental diameter (PD), and placental thickness (PT) and (E-H) obtained ex vivo by light microscopy.
