"Terminology "
"trisomy 21: isolated fetal renal pyelectasis is not considered to increase the risk of aneuploidies, however, in combination with other soft markers, the risk will increase 14 (see antenatal features of Down syndrome)"
"Pyelectasis can result from a number of factors. In the majority of cases, it is physiological and resolves spontaneously. However, it may also herald the presence or evolution of renal tract pathology, such as:"
">4 mm up to 28 weeksor"
"fetal PUJ obstruction"
"Fetal pyelectasis is assessed as an AP measurement of the renal pelves on an axial plane ultrasound image."
Expected headings
"Terminology "
"Associations"
"Fetal pyelectasis can be a relatively common finding on antenatal ultrasounds, often detected at the routine 2nd trimester morphology scan. There is a recognised male predilection. The estimated prevalence is at ~2% of routine second trimester scans 13."