Wilms' tumor is also known as nephroblastoma. It is the most common malignancy in children. The signs and symptoms of Wilms' tumor are: - fever - hematuria - abdominal pain and swelling - nausea and vomiting - hypertension - anorexia - constipation Reference: https://www.mayoclinic.org/diseases-conditions/wilms-tumor/symptoms-causes/syc-20352655 Image via: https://www.researchgate.net/publication/318491142_Wilms%27_Tumor_Histopathological_Variants_and_the_Outcomes_of_31_Cases_at_a_Tertiary_Care_Center_in_Northern_India/figures?lo=1