Review Question - QID 216369

A 75-year-old man presents to his primary care doctor for follow-up of liver nodules, which were found incidentally on computed tomography (CT) scan after a recent emergency department visit. He describes himself as healthy, does not take any medications, and denies current or past alcohol, tobacco, or drug use. He mentions that he worked for 35 years at a polyvinyl chloride (PVC) factory, during which time he was frequently exposed to chemicals including vinyl chloride. A CT-guided fine-needle aspiration of the lesion reveals many small blood vessels lined by pleomorphic endothelial cells which stain positively for CD31. The hematoxylin and eosin (HE) stain is shown in Figure A. Which of the following is