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Fig. 1A. —31-year-old man with neoplastic pulmonary emboli from abdominal desmoplastic small round-cell tumor. CT scan obtained with 5-mm-thick collimation and photographed with lung window. Enlarged and beaded segmental and subsegmental pulmonary arteries (A) are seen in right middle and lower lobes. Tree-in-bud pattern is visible in peripheral zone of right middle lobe (arrow).