Answer:

Explanation
a) Portal vein aneurysms may mimic a hepatic cyst. [As seen in case 2, this finding can mimic a cyst which is why color Doppler interrogation is imperative, demonstrating a non-pulsatile, monophasic waveform in the setting of portal vein aneurysm.]

b) Portal vein aneurysms may mimic a solid mass. [If thrombosed, the aneurysm may appear echogenic mimicking a solid mass.]

c) Portal vein aneurysms may mimic a neuroendocrine tumor. [Ultrasound is also useful in differentiating a portal vein aneurysm from a hypervascular pancreatic mass, which can be seen with neuroendocrine tumors or metastatic disease.]

d) All of the above statements are true and therefore d is the correct answer.

e) Answer choices a, b, and c are correct, therefore answer choice e is incorrect.