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Fig. 1D. 30-year-old woman with choriocarcinoma and multiple pulmonary
metastases. Unenhanced chest CT scans obtained after eight courses of
methotrexate and leucovorin therapy for 2 years show two nodules
(arrows) in left lung. These residual nodules communicate with
curvilinear structures (arrowheads), suggesting arteriovenous
fistulas.