肾胚胎瘤亦称肾母细胞瘤是婴儿及小儿常见的腹部恶性肿瘤之一。常于6岁以前发病,此肿瘤主要侵犯肾实质,早期无症状,当发展到一定程度时往往以腹部肿块就医。少数病人发生血尿者,被认为是肿瘤晚期预后不良之表现。本文介绍一例早期肾胚胎瘤突向肾盂内生长,早期发生血尿,经B型超声发现肿瘤并经病理证实,报告如下: Renal blastoma, also known as nephroblastoma, is one of the common abdominal malignancies in infants and children. Often before the age of 6 years of age, this tumor mainly affects the renal parenchyma, early asymptomatic, when the development to a certain extent, often to abdominal mass medical treatment. A small number of patients with hematuria, is considered to be poor prognosis of the performance of advanced cancer. This article describes an example of early renal cyst rupture protruding into the renal pelvis, early hematuria, tumor found by B-mode ultrasound and confirmed by pathology, the report is as follows: