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Figure 1: The various stages of passage of the contrast. Upper left: Precontrast scan in lung window. Upper right: Postcontrast pulmonary arterial phase in lung window. Lower right: Pulmonary arterial phase in mediastinal window. Lower left: Delayed phase in lung window

Figure 1: The various stages of passage of the contrast. Upper left: Precontrast scan in lung window. Upper right: Postcontrast pulmonary arterial phase in lung window. Lower right: Pulmonary arterial phase in mediastinal window. Lower left: Delayed phase in lung window