The shadow of vessels masquerading as a lung mass.

A 72-year-old man reported tarry stool for a day in the emergency department of a hospital. It was diagnosed that he had colon adenocarcinoma, and underwent left hemicolectomy 3 years ago. He did not receive any chemotherapy. A routine chest x-ray showed a round shadow in the upper lobe of his right lung (figure 1). He denied having fever, cough, …