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Figure 1 A 45-year-old female patient with cardiovascular risk factors (hyperlipidemia, 30 pack years of smoking) and atypical angina. Conventional coronary angiography (c) excludes coronary artery disease. The entire coronary tree is well visualized at computed tomography angiography. Excellent image quality of the displayed coronary tree with no calcifications present (Agatston score 0). The volume rendering technique images (a) suggest a significant lesion of the small caliber septal branch (arrow). However, maximum intensity projections and curved maximum intensity projection images (b) of the left main, right coronary artery (e), the left anterior descending coronary artery (d), and of the septal branch as well as the circumflex coronary artery (f) show only slight tapering of the vessel without a significant lesion.