Figure 1. a: Ultra-sound examination showed an enlarged, heterogeneous testis with multiple hypoechoic masses (star); b: Malignant cells with large and scant cytoplasm and large vesicular nuclei (HE x 400); c: Positivity of the tumor cells with the B cell marker (HE x 400); d: Positivity of tumor cells with bcl 6 (HE x 400).