Myocardial bridging of the left anterior descending coronary artery: depiction rate and morphologic features by dual-source CT coronary angiography.
OBJECTIVE
To evaluate the depiction rate and morphologic features of myocardial bridging (MB) of the left anterior descending coronary artery (LAD) using dual-source CT (DSCT).


METHODS
CT scans from a total of 1,353 patients who underwent DSCT were reviewed retrospectively for LAD-MB. Seventy-eight patients were excluded due to poor image quality or poor enhancement of the coronary artery. The length and depth of the MB were analyzed and classified as superficial or deep with respect to the depth (<or= 1 or > 1 mm) of the LAD tunneled segment. Superficial MB was subdivided into complete or incomplete types according to full or partial encasement of the myocardium.


RESULTS
Of the 1,275 patients included in this study, 557 cases of MB were found from 536 patients (42%). Superficial MB was observed in 368 of 557 (66%) cases, and deep MB was seen in 189 of 557 (34%) cases. Superficial MB showed 2 types: complete (128 of 368, 35%) and incomplete (240 of 368, 65%). The mean length of a tunneled segment for superficial MB was 16.4 +/- 8.6 mm. The mean length and depth of a tunneled segment for deep MB were 27.6 +/- 12.8 mm and 3.0 +/- 1.4 mm, respectively. The incidence of atherosclerotic plaques in a 2-cm-long segment proximal to MB was 16%.


CONCLUSIONS
The depiction rate of LAD-MB using DSCT in a large series of patients was 42%, with two-thirds of MB segments being the superficial type.
Hwang
Jin Ho
JH
Department of Radiology, Konkuk University Hospital, Konkuk University School of Medicine, Seoul, Korea.
Ko
Sung Min
SM
Roh
Hong Gee
HG
Song
Meong Gun
MG
Shin
Je Kyoun
JK
Chee
Hyun Kun
HK
Kim
Joon Suk
JS
D003287:Contrast Media; D017023:Coronary Angiography / Q000379:methods*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007472:Iohexol / Q000031:analogs & derivatives; D008297:Male; D008875:Middle Aged; D054084:Myocardial Bridging / Q000000981:diagnostic imaging*; D011857:Radiographic Image Interpretation, Computer-Assisted; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed / Q000379:methods*
D003287:Contrast Media; D007472:Iohexol; C038192:iopromide
AJR Am J Roentgenol. 2006 Jun;186(6 Suppl 2):S391-4
16714614
Semin Ultrasound CT MR. 2008 Jun;29(3):195-203
18564543
Eur J Radiol. 2008 Dec;68(3):434-41
18993003
Circ J. 2010 Jan;74(1):137-41
19966506
Am J Cardiol. 1976 Jun;37(7):993-9
1274883
J Formos Med Assoc. 2009 Jun;108(6):469-74
19515627
Eur J Radiol. 2009 Jan;69(1):156-64
18023550
Br J Radiol. 2007 Sep;80(957):e196-200
17928487
Int J Cardiovasc Imaging. 2010 Feb;26 Suppl 1:93-101
20033490
AJR Am J Roentgenol. 2009 Apr;192(4):1051-6
19304713
Am J Cardiol. 2007 Oct 1;100(7):1081-2
17884365
J Am Coll Cardiol. 2007 Feb 6;49(5):587-93
17276183
J Am Coll Cardiol. 2009 Sep 15;54(12):1072-84
19744616
Int J Cardiol. 2004 Jun;95(2-3):335-7
15193842
Eur Heart J. 2005 Jun;26(12):1159-68
15764618
Eur Heart J. 1980 Aug;1(4):239-45
7274234
Radiology. 2008 May;247(2):346-55
18372455
J Comput Assist Tomogr. 2008 Mar-Apr;32(2):242-6
18379310
Eur J Radiol. 2010 Jan;73(1):89-95
19038513
Am Heart J. 1982 Feb;103(2):283-8
7055058
Acta Radiol. 2009 Sep;50(7):775-80
19572218
Radiology. 2008 Mar;246(3):754-62
18223120
AJR Am J Roentgenol. 2007 Apr;188(4):1074-80
17377050
AJR Am J Roentgenol. 2007 Sep;189(3):567-73
17715102
J Comput Assist Tomogr. 2005 Mar-Apr;29(2):238-40
15772545
Int J Cardiol. 2010 Sep 3;143(3):243-8
19327854
Radiology. 2009 Oct;253(1):56-64
19587311
Circulation. 2009 Mar 17;119(10):1408-16
19255347
Korean J Radiol. 2009 Jul-Aug;10(4):347-54
19568462
Circ J. 2008 Jul;72(7):1079-85
18577815
Circulation. 2002 Nov 12;106(20):2616-22
12427660
J Cardiovasc Comput Tomogr. 2007 Oct;1(2):78-83
19083883
Int J Cardiovasc Imaging. 2008 Apr;24(4):445-52
17929194
Eur J Radiol. 2007 Jan;61(1):130-8
17045767
J Comput Assist Tomogr. 2008 May-Jun;32(3):448-51
18520555
AJR Am J Roentgenol. 2007 Apr;188(4):1069-73
17377049
J Am Coll Cardiol. 2003 Feb 5;41(3):351-9
12575960
Radiol Med. 2009 Oct;114(7):1024-36
19697102
Acta Cardiol. 2009 Jun;64(3):341-6
19593944