A 28-year-old primigravida at 32 weeks of gestation presents with a fundal height 4 cm less than expected. Ultrasound confirms IUGR with estimated fetal weight at the 8th percentile. Doppler studies show normal umbilical artery PI and normal middle cerebral artery PSV. Which single finding best distinguishes constitutionally small fetuses from pathological IUGR in this scenario?

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