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Click A 48-year-old woman with single coronary artery arising from the right sinus of Valsalva.
Contrast CT demonstrating the left coronary artery and right coronary artery arising from a single ostium from the right coronary cusp. The LCA continues anterior to the right ventricular outflow tract before branching into a marginal artery and circumflex artery. The left anterior descending artery is absent. The right coronary artery forms the right posterior descending artery. The left coronary artery has a long transverse course anterior to the right ventricular outflow tract and pulmonary artery.
The distal right coronary artery containing a spot of calcified plaque with minimal stenosis. The rest of the right coronary artery is patent.

TECHNIQUE: Contrast CT using a 320-slice single-source scanner (Aquilion ONE; Toshiba Medical Systems Corporation, Tokyo, Japan) with an injection of 60 ml of a low-osmolar contrast agent, iohexol (Omnipaque 350, GE Healthcare Inc.) at 4.5 ml/s. (ECG-gated, prospective gating, helical scan; A bolus-tracking method (monitoring level: carina; monitoring delay: 5 seconds; placement of ROI: descending aorta and HU threshold:180) was used to time the scan acquisition trigger; 1.8 sec rotation time; pitch 0; 120 kV, 438 mA; slice thickness 0.5 mm).

Click A 48-year-old woman with single coronary artery arising from the right sinus of Valsalva.
Three-dimensional volume-rendered reformations demonstrating the left coronary artery and right coronary artery arising from a single ostium from the right coronary cusp. The LCA continues anterior to the right ventricular outflow tract before branching into a marginal artery and circumflex artery. The left anterior descending artery is absent. The right coronary artery forms the right posterior descending artery. The left coronary artery has a long transverse course anterior to the right ventricular outflow tract and pulmonary artery.

TECHNIQUE: Contrast CT with three-dimensional volume-rendered reconstruction performed

Click A 48-year-old woman with single coronary artery arising from the right sinus of Valsalva.
Three-dimensional volume-rendered reformations demonstrating the left coronary artery and right coronary artery arising from a single ostium from the right coronary cusp. The LCA continues anterior to the right ventricular outflow tract before branching into a marginal artery and circumflex artery. The left anterior descending artery is absent. The right coronary artery forms the right posterior descending artery. The left coronary artery has a long transverse course anterior to the right ventricular outflow tract and pulmonary artery.

TECHNIQUE: Contrast CT with three-dimensional volume-rendered reconstruction performed

Click A 48-year-old woman with single coronary artery arising from the right sinus of Valsalva.
Three-dimensional volume-rendered reformations demonstrating the left coronary artery and right coronary artery arising from a single ostium from the right coronary cusp. The LCA continues anterior to the right ventricular outflow tract before branching into a marginal artery and circumflex artery. The left anterior descending artery is absent. The right coronary artery forms the right posterior descending artery. The left coronary artery has a long transverse course anterior to the right ventricular outflow tract and pulmonary artery.

TECHNIQUE: Contrast CT with three-dimensional volume-rendered reconstruction performed

Click A 48-year-old woman with single coronary artery arising from the right sinus of Valsalva.
Three-dimensional volume-rendered reformations demonstrating the left coronary artery and right coronary artery arising from a single ostium from the right coronary cusp. The LCA continues anterior to the right ventricular outflow tract before branching into a marginal artery and circumflex artery. The left anterior descending artery is absent. The right coronary artery forms the right posterior descending artery. The left coronary artery has a long transverse course anterior to the right ventricular outflow tract and pulmonary artery.

TECHNIQUE: Contrast CT with three-dimensional volume-rendered reconstruction performed