Wilms' Tumor, also known as nephroblastoma, is a rare form of kidney cancer that primarily affects children. It is named after Dr. Max Wilms, a German surgeon who first documented the disease in 1899. In medical literature, Wilms' Tumor is often referred to as embryonal renal carcinoma, renal adenosarcoma, or pediatric renal tumor. While these terms are technically correct, they are less commonly used than the more familiar name of Wilms' Tumor. Additionally, some doctors may refer to the cancer simply as a kidney tumor or pediatric kidney cancer, although these terms are not specific to Wilms' Tumor and can refer to other types of kidney cancers.