EWSR1 and neoplasm: The tumor shows epithelial and mesenchymal properties and neural differentiation, and the cells present the translocation t(11;22)(p13;q12), which juxtaposes the gene, EWSR1, to the tumor suppressor gene, WT1 (112,113), whose identification in specialist laboratories is very helpful for a correct differential diagnosis, complicated by similarities with other small round cell tumors.