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Fig. 2. —Midsternal stripe sign is visualized in 61-year-old man after median sternotomy and coronary artery bypass surgery. Coned-down radiograph of mediastinum from portable chest radiograph reveals midsternal radiolucency (paired arrows) measuring slightly less than 3 mm at greatest width. Sternal wires show normal alignment in vertical row with no significant displacement. (This radiograph of patient in study cohort was not one of images reviewed for study because it was obtained after sternal rewiring for dehiscence; however, it was selected for illustrative purposes because of highly visible stripe and sutures.)