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Fig. 2C. —Middle pulmonary lobe and lingula in 31-year-old man with pulmonary nodules. S4 and S5 = segments 4 and 5, respectively. Curved multiplanar reformatted ECG-gated CT images (A and C) with segmental separations (white lines) and corresponding subtraction images (B and D, respectively) emphasize differences between pulmonary structures during cardiac R-R intervals with minimal and maximal shift. Pulmonary structures in segment 5 adjacent to myocardial wall (arrowhead, B) shift significantly during cardiac phase. Significant structural shift is observed in ventroapical portions of segment 4 (arrowhead, D). Black lines delineate pulmonary fissures.