Intermediate
Technical
IVT
placental lakes
Hypoechoic areas within the placenta on ultrasound representing dilated venous channels or intervillous spaces.
Full Definition
Placental lakes are hypoechoic or anechoic areas seen within the placental parenchyma on ultrasound imaging, representing dilated maternal venous channels or enlarged intervillous spaces. These findings are generally considered normal variants, especially when small and few in number. However, large or numerous placental lakes may be associated with increased risk of fetal growth restriction, preeclampsia, or placental insufficiency and warrant closer monitoring.
Usage
Usage note: Distinguish from pathologic placental changes like infarcts or hematomas.
In Context
- "Multiple small placental lakes were noted on routine second-trimester ultrasound." — Ultrasound report
- "Large placental lakes covering more than 30% of the placental volume may indicate placental dysfunction." — Medical literature review
Also known as
venous lakes
intervillous lakes
Don't confuse with
placental infarcts
retroplacental hematoma