What Causes a Dilated Renal Pelvis?

Pyelonesis refers to a fetus with a congenital type of fetal kidney that is the main cause of fetal kidney abnormalities. Part of the phenomenon may be the separation of the kidney collection.

Pyelone dilatation

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Pyelonesis refers to the fetal kidney

The collection system of normal fetal kidneys can be slightly separated, with a separation diameter of up to 6 mm, and the pelvis dilatation 10 mm or the presence of pyloric dilatation after gestational age is greater than

Although the progress of ultrasound instruments

Despite controversy over diagnostic criteria, there is a convergence of principles that are:

(1) The renal pelvis is dilated <4mm, and most fetuses are normal fetuses.

(2) The renal pelvis is dilated to 5-10mm, or there is bladder dilatation,

definition

Spherical or elliptical non-echoic area in the renal pelvis, diameter 5mm10mm.

Measurement methods

The maximum anteroposterior diameter was measured at the horizontal section of the fetal renal pelvis. The normal measurement was <5mm.

Relationship with fetal haploid abnormalities

In fetuses between 16 and 26 weeks of gestation, the rate of unilateral pyelopathy is found to be approximately 0.7%. In Down's syndrome fetuses, only 2% of those with mild renal pelvis dilatation were detected by ultrasound.