Wilms tumours with a greater number of heterologous elements on histology are considered as teratoid form of Wilms tumour. The presence of teratoid components in Wilms tumour are resistant to chemotherapy and may warrant additional treatment. On microscopy, the epithelial component in Wilms tumour most commonly present in form of tubules or glomeruloid bodies as homologous differentiation and less commonly as heterologous elements such as squamous or mucinous epithelium. Other common heterologous elements described in the literature are skeletal muscle, smooth muscle, adipose tissue and cartilage. Though the transitional lining is homologous to the kidney, nests of urothelial cells within Wilms tumour is not described well in the literature. We describe the presence of urothelial nests intimately admixed with other homologous and heterologous components of Wilms tumour in post-chemotherapy nephrectomy specimen.