Wilms tumor of the kidney characterized by the predominance of the mesenchymal component. The disease is stromal predominant kidney Wilms tumor (MONDO_0006432). Also known as: stromal predominant Wilms tumor, stromal predominant Wilms tumour, stromal predominant kidney Wilms' tumor, stromal predominant kidney Wilms' tumour, stromal predominant kidney adenosarcoma, stromal predominant nephroblastoma, stromal predominant renal Wilm's tumor, stromal predominant renal Wilm's tumour.