Hemorrhagic and necrotizing nephroblastoma with rupture. Description: nephrectomy of 187 g. On the renal upper pole, a red-brown tumor of 7 cm, appearing to be completely necrotized. The tumor has ruptured and is irregularly delimited.
Additional finding: 90% of tumor necrosis after pre-operative chemotherapy.
Clinical history: 7 year old male patient with suspected Wilm's tumor).
The Wilm's tumor is an embryonal, malignant, mixed tumor of the kidney. Initially, it grows expansively, later infiltrating, and it predominantly metastasizes into the lymph nodes and lungs.