Abstract
We report a case of double cancer of acute lymphoblastic leukemia (ALL) and renal cell carcinoma. A 6-year-old boy was referred to the hospital to make a correct diagnosis for a suprarenal mass detected by CT and ultrasound. He underwent needle biopsy and pathological finding was consistent with renal cell carcinoma. In the consolidation phase, he underwent left nephrectomy. The mass was completely removed with a negative margin and the pathological stage was pT2NOMO. Six months after the surgery, he underwent bone marrow transplant from an unrelated donor for his ALL.