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Fig. 4. —58-year-old man with deep venous thrombosis seen on MR venography. During same sitting, contrast-enhanced axial gradient-recalled echo MR pulmonary angiogram was obtained and reveals absence of signal in main pulmonary artery extending into right pulmonary artery, which is diagnostic of pulmonary embolism (arrowheads). (Courtesy of Spritzer CE, Durham, NC)