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Figure 14c. Spiral CT angiography (5-mm collimation, pitch of 1, 30% iodinated contrast agent, inferosuperior acquisition) indicated for the suspicion of a left superior vena cava in a 76-year-old patient with obstructive airway disease. (a, b) Spiral CT scans show the partial anomalous pulmonary venous drainage of the left upper lobe (arrow in a) into a vertical vein (arrow in b). (c) Coronal reformation confirms the confluence of the left upper lobe pulmonary veins (short arrows) into the left vertical vein (long arrow), which drains into the left brachiocephalic vein ().