Often, a neoplasm is detected by chance, when a round, soft-elastic formation in the abdomen is found in a healthy child. The germination of a malignant node in the pyelocaliceal system of the kidney can cause hematuria (the appearance of a visible admixture of blood in the urine). Compression of soft tissues by an increasing tumor leads to the addition of abdominal pain and disruption of the intestines. In the advanced stage, in addition to local ones, general symptoms characteristic of oncological diseases can also be observed: fatigue, sweating, persistent fever, and weight loss.