Fig. 1

Ultrasound and magnetic resonance imaging. A Ultrasonography showed internally hypoechoic heterogeneous mass, 5.5-cm-long diameter in size. The tumor showed a clearly demarcated solid mass. B, C T2 weighted images by magnetic resonance imaging examination revealed heterogeneous low intensity mass (white arrows) including focal high intensity areas (B coronal imaging, C axial imaging). Left testis was confirmed (yellow arrow). D Diffusion-weighted imaging shows no apparent decreasing ADC value in the internal area of the mass; however, this is focally observed in peripheral area (white arrow)