Fetal bilateral renal pelvis separation in four-dimensional ultrasound: boy or girl?

Generally, bilateral renal pelvis dilation observed in four-dimensional ultrasound has no correlation with fetal sex and usually cannot be used to determine whether the baby is a boy or a girl.

Bilateral renal pelvis dilation, also known as pyelectasis, is a condition commonly detected during a four-dimensional color ultrasound examination in pregnant women. It refers to the expansion of the fetal renal pelvis. This condition may occur when the fetus temporarily retains urine in the uterine cavity, causing the renal pelvis to become enlarged. Alternatively, it could result from ureteral malformations that prevent normal urine drainage, leading to accumulation and dilation of the renal pelvis. In either case, this condition is generally unrelated to fetal gender.

If a four-dimensional ultrasound indicates bilateral renal pelvis dilation in the fetus, and the measurement does not exceed ten millimeters, regular follow-up examinations are usually sufficient. For more severe cases, amniocentesis is recommended to rule out the possibility of fetal chromosomal abnormalities. Pregnant women should maintain healthy lifestyle habits, avoid staying up late, ensure adequate sleep, consume sufficient high-quality protein foods such as milk and eggs, eat plenty of fresh vegetables and fruits, and attend routine prenatal checkups regularly.