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Fig. 1 —Diagram illustrates bending of primitive cardiac tube (top
row) and possible relationships of great arteries at semilunar valve
level (bottom row). Cardiac tube is depicted from anterior view.
Cardiac tube comprises atrium (A), ventricle (V), bulbus cordis (B), and
truncus arteriosus (T). Cardiac tube normally bends to right, forming a
D-bulboventricular loop. Rarely, tube may bend leftward, forming
L-bulboventricular loop. Possible relationships of great vessels are depicted
axially from inferior perspective (as seen on CT images in transverse plane).
In D-bulboventricular loop, possible relationships are normal or D-TGA
(transposition of great arteries). With L-bulboventricular loop, possible
relationships are inverted, or L-TGA. Ao = aorta, P = pulmonary artery.
