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A 32-year-old man with primary neuroendocrine tumor. The patient had no underlying liver disease. Conventional ultrasound showed that a slightly hyperechoic tumor with largest diameter of 10.3 centimeters in left liver lobe (A). In the arterial phase of contrast-enhanced ultrasound, the tumor showed homogeneous hyperenhancement (B), and began washout at 56 seconds (C), hypoenhancement in the late phase (D).
