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Scimitar sign. Scimitar syndrome in patients with abnormal pulmonary venous return. The scimitar sign (white arrows in a and b) can be easily recognized: the anomalous vessel often runs as a radiopaque tubular structure parallel to the right margin of the cardiac shadow (anterior-posterior CT scout and coronal CT reformatted images), reproducing the shape of the famous Turkish curved sword (c). On axial CT scan (d), the abnormal pulmonary vein is clearly recognizable (white arrow)
