The mother of a 3-year-old boy found a tumor-like formation in the abdomen while bathing the child. During the examination, a dense, painless, flat surface, sedentary is determined tumor-like formation of large size, located under the left costal arch. Body temperature - 37.5°C, heart rate - 110/min., AT - 150/90 mm Hg. Art. In the general analysis of blood detected: erythrocytes - C, 2 × 1012/ l, Hb - 90 g/l, leukocytes - 10.4 × 10 ^ g/l, ESR - 35 mm/h. In the general analysis of urine it is revealed: erythrocytes on all field of view. What disease is possible to suspect a child?