What's your diagnosis based on these images of the fetal abdomen?

These images show this fetus has a large simple cyst in relation to the left fetal kidney. The lesion contains clear fluid with no particles or debris within it. Such cysts are extremely rare during fetal life and must be followed to look for changes in size and content.

Pregnancy and Birth

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This image quiz focuses on the kidneys. Can you identify the abnormality seen in these ultrasound images of the fetal abdomen?