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Fig. 6 —76-year-old man with acute dyspnea and hypotension after sigmoid colectomy. CT scan shows Swan-Ganz catheter (black arrow) in right main pulmonary artery, with adjacent streak artifact. Note low-attenuation abnormality posterior to right main pulmonary artery (white arrow), which may represent pulmonary embolism or beam-hardening artifact from Swan-Ganz catheter. Moderate-sized bilateral pleural effusions with adjacent atelectasis are also seen.