肾盂扩张指的是胎儿肾异常主要原因先天愚型的胎儿，部分可出现肾集合部分离的现象。
中重度肾盂扩张者，易合并泌尿系或其他器官异常。
Those with moderate and severe pyelectasis are likely to have abnormalities of urinary or other systems.
梗阻、扩张引起的肾盂积水导致了感染。
The stasis from the obstruction and dilation led to infection.
而若为肾内肾盂，肾盏扩张和肾实质损害均严重。
In the intrarenal pelvis, caliceal dilatation and renal parenchymal damage are maximal.
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