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Figure 4a. Case 1. Follow-up transverse CT scans. (a) Effusions were considerably larger and filled more than 50% of each thoracic cavity on hospital day 4. (b) Mediastinal nodes also increased in size, and a hyperattenuating blood clot (arrow) in the left pleural space could be seen on hospital day 9. (c) Subcarinal and left hilar nodes remained enlarged on hospital day 19 despite substantial clinical improvement.