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Helical CT Angiography with Maximum Intensity Projection in the Assessment of Aortic Coarctation After Surgery

G. J. Schaffler1, E. Sorantin1, R. Groell1, A. Gamillscheg2, E. Maier2, H. Schoellnast1 and R. Fotter1

1 Department of Radiology, University Hospital Graz, Auenbruggerplatz 9, A-8036 Graz, Austria.
2 Department of Pediatric Cardiology, University Hospital Graz, A-8036 Graz, Austria.



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  		Fig. 1A. —16-year-old boy after surgical repair of aortic coarctation. Sagittal maximum-intensity-projection reconstruction shows circumscribed narrowing (arrows) of postoperative aorta.

 


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  		Fig. 1B. —16-year-old boy after surgical repair of aortic coarctation. Sagittal catheter angiogram shows circumscribed narrowing (arrows) of postoperative aorta.

 


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  		Fig. 2A. —14-year-old boy after surgical repair of aortic coarctation. Sagittal maximum-intensity-projection reconstruction shows diffuse dilatation of postoperative aortic segment (straight arrows) and calcified arteriosclerotic plaque (curved arrow).

 


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  		Fig. 2B. —14-year-old boy after surgical repair of aortic coarctation. Sagittal catheter angiogram shows diffuse dilatation (arrows) of postoperative segment.

 


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  		Fig. 3A. —16-year-old boy after surgical repair of aortic coarctation. Sagittal maximum-intensity-projection reconstruction shows circumscribed pouch (arrow) at anterior circumference of postoperative aortic segment.

 


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  		Fig. 3B. —16-year-old boy after surgical repair of aortic coarctation. Contrast-enhanced transverse CT scan shows anterolateral pouch (curved arrow) that is separated from aortic lumen by thin intimal flap (black arrows). Small intramural calcification is delineated at lateral contour of pouch (straight white arrow).

 


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  		Fig. 3C. —16-year-old boy after surgical repair of aortic coarctation. Sagittal catheter angiogram shows circumscribed pouch (arrow) at anterior circumference of postoperative aorta. Distinct calcified plaque of aortic wall is not delineated.

 


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  		Fig. 4A. —19-year-old man after surgical repair of aortic coarctation. Sagittal maximum-intensity-projection reconstruction shows extensive calcification (arrows) at posterior circumference of postoperative aorta.

 


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  		Fig. 4B. —19-year-old man after surgical repair of aortic coarctation. Sagittal catheter angiogram shows smooth and sharp contour, and no calcifications are delineated.

 


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  		Fig. 5. —Scatter diagram shows good correlation (r=0.98) between narrowest diameters of segment of former coarctation measured with angiography and CT.

 


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  		Fig. 6. —Scatter diagram shows good correlation (r=0.99) between narrowest diameters of descending aorta measured with angiography and CT.

 


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  		Fig. 7. —Scatter diagram shows that systolic pullback pressure gradient did not correlate (r=-0.04) with diameter ratio of former coarctation and descending aorta.

 

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