An Unusual Case of Dual Left Anterior Descending Artery with Coronary Computed Tomographic Angiographic Correlation
Table 1
Classification of dual LAD on coronary CTA, adapted from [4].
Type
Short LAD course
Long LAD course
Origin of septal perforator
Origin of diagonal vessels
I
(i) Originates from LAD proper (ii) Terminates high in IV groove
(i) Originates from LAD proper (ii) Courses to left of IV groove (iii) Reenters distal IV groove
(i) Short LAD
(i) Long LAD (ii) LAD proper (iii) Both
II
(i) Originates from LAD proper (ii) Terminates high in IV groove
(i) Originates from LAD proper (ii) Courses to right of IV groove (iii) Reenters distal IV groove
(i) Short LAD
(i) LAD proper
III
(i) Originates from LAD proper (ii) Terminates high in IV groove
(i) Originates from LAD proper (ii) Myocardial course within IV septum proximally (iii) Epicardial course within IV groove distally or (iv) Gives terminal branches at apical IV groove
(i) Short LAD (ii) Long LAD
(i) Short LAD (ii) LAD proper
IV
(i) Originates from left main (ii) Terminates high in IV groove
(i) Originates from right coronary artery (ii) Anomalous prepulmonic course (iii) Reenters distal IV groove
(i) Short LAD
(i) Short LAD
V
(i) Originates from left coronary cusp (ii) Terminates high in IV groove
(i) Originates from right coronary cusp (ii) Aberrant septal course (iii) Reenters distal IV groove
