Precise diagnosis of Stanford type A aortic dissection is crucial and time sensitive, especially in emergency cases. Diagnostic procedures have been conducted by computed tomographic (CT) scan, ultrasonography, or both.1 Diagnosis of type A dissection is sometimes difficult, however, because many unique types of dissection—such as localized small dissection, retrograde dissection, or circumferential dissection, called intimointimal intussusception2—have been reported. Moreover, in cases of dissection, CT scans a few days after the onset sometimes show the dynamic morphologic changes of a small ulcer or a flaplike lesion, which annoys physicians attempting the accurate diagnosis of aortic dissection.
