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Fig. 4B —ECG-gated axial spin-echo T1-weighted MR images in patient with
dextrocardia, situs solitus, and corrected transposition of great arteries
(TGA). (Reprinted with permission from Reddy GP, Caputo GR. Diagnosis please:
case 15. Radiology 1999; 211:709-710
[2]) Images at progressively
higher levels show muscular outflow tract or infundibulum (I, top
image), which is characteristic of a morphologic right ventricle.
Pulmonary artery (P) arises from outflow tract of morphologic left ventricle
(LV, top image). Right-sided atrioventricular valve (arrowhead,
top image) is near root of pulmonary artery because of fibrous continuity
of inflow and outflow valves characteristic of a morphologic left ventricle.
In lower image, aortic root (A) arises from morphologic right ventricle.
Discordant atrioventricular and ventriculoarterial connections define disorder
as congenitally corrected TGA. This case represents L-TGA because aorta is to
left of pulmonary artery. RA = right atrium, S = superior vena cava.
