Absent Physiologic Conversion of Uteroplacental Vessel

**Semantic type:** Finding

**Definition:** Failure of the maternal spiral arteries to be transformed by extravillous cytotrophoblast to increase blood flow into the placental intervillous spaces, which may lead to an increased risk of early-onset pre-eclampsia and fetal growth restriction.

**Synonyms:** - Placental Membrane Arteriole Mural Hypertrophy - Placental Membrane Arteriole Mural Hypertrophy