Pyelectasis

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Pyelectasis is a dilation of the renal pelvis. The term is derived from the prefix pyelo- meaning "pelvis" and ectasia meaning "dilation or distension". It is a relatively common ultrasound finding and is three times more common in male fetuses. In most cases pyelectasis resolves normally, having no ill effects on the baby.

Pyelectasis is considered to be a "soft marker” for Down syndrome. This, along with other factors such as age and a Triple test, may be grounds for an amniocentesis to test for Down syndrome.

Babies with unresolved pyelectasis may experience urological problems requiring surgery.