Presentation
Routine second trimester scan.
Patient Data
Age: 30 years
Gender: Female
From the case:
Fetal pyelectasis
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Info
Mild right kidney pyelectasis (renal pelvis AP diameter = 4.6 mm).
Normal left kidney with collapsed pelvicalyceal system.
Case Discussion
Fetal pyelectasis is considered if the renal pelvis AP diameter is more than 4 mm (if <28 weeks) or more than 7 mm (if > 28 weeks). It can be unilateral or bilateral. In the vast majority of cases, it resolves spontaneously. Of note, isolated fetal renal pyelectasis is not considered to increase the risk of aneuploidies.
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