Fig. 1

Computed tomography and emission computed tomography of a 29-year-old man with a giant abdominal mass. a Computed tomography of the abdomen on May 6, 2015 before the surgery demonstrates a giant (22 cm × 16 cm) solid mass in the left kidney without necrosis or calcifications. Heterogeneous enhancement can be seen during the arterial phase, and normal renal tissues are seriously squeezed. b Emission computed tomography reveals mild-to-moderate damage of the left kidney and normal function of the right kidney