Testicular choriocarcinoma. A 25-year-old male with an unremarkable past medical history presenting with right testicular palpable mass and mild tenderness. Color Doppler US shows a large heterogeneous solid mass (asterisk) with no apparent internal vascularity on color Doppler study. Differential diagnoses based on US findings were necrotic testicular tumor, testicular hematoma or testicular abscess. As the concomitant serum beta-hCG levels were extremely high (150.000 mlU/mL), a testicular choriocarcinoma was considered as the leading diagnosis. Histopathological examination confirmed testicular choriocarcinoma