Curve multiplanar reconstruction image shows intramyocardial course and shifting into myocardium of middle LAD with inhibitor order us typical ��step down-step …Table 2Classification of MB according to location, thickness, and length of myocardial bridge segment.The average length and thickness of MB in all segments of the coronary arteries were 17.6 �� 5.7mm (ranged from 8 to 40mm) and 2.7 �� 0.7mm (ranged from 1.6 to 5.0mm), respectively.Through quantity measurement of MB-MCA that located in the middle segment of LAD, we found that ��thickness of MB, ��diameter and ��length of MCA between ED and ES phase were statistically significant (P < 0.05, Table 3). The average diameter reduction of MCA in the middle segment of LAD from diastole to systole phase was 1.1 �� 0.4mm (ranged from 0.3 to 2.

3mm) (Figures (Figures22 and and3).3). Figure 4 showed the percent ��thickness of MB, ��diameter and ��length of MCA from ED to ES phase, and ��thickness was the largest, followed by ��diameter, and ��length was the smallest. Furthermore, 34.9% of the MCA have diameter reduction more than 50% in systole phase.Figure 3256-slice CT angiography images of 45-year-old man with chest pain for 3 years. Short axis MPR images show LAD encased by a bridge with a thickness of 3.0mm in ED phase (a) and 5.8mm in ES phase (b). The diameter of MCA changed from …Figure 4The comparison of the percent change in thickness of MB, diameter and length of MCA from ED to ES phase. The bar graph showed that the percent of thickness change (��thickness) of MB was the largest from ED to ES phase, followed by the percent .

..Table 3Quantity analysis of MB-MCA in the middle segment of LAD (n = 178) during ED and ES phase using CT cine technique.The overall prevalence of atherosclerosis in patients with MB-MCA was 33.4% (112/335), and isolated atherosclerosis plaque was found in 86 patients (26.6%), especially in the proximal segment of MB-MCA (64/335, 19.1%) (Figure 5).Figure 5256-slice CT contrast-enhanced coronary angiography image of 44-year-old man with hypercholesterolemia. Curved multiplanar reconstruction image showed long segment of MB on LAD (long arrow) and soft plaque just proximal to bridging (short arrow) in ED …4. DiscussionAs one of the nonatherosclerotic anatomic abnormalities of the coronary arteries, MB-MCA has become a common disease with the development of coronary artery examination modalities. However, the relationship between MB and symptoms is still unclear. The clinical significance of MB is most likely due to the anatomic narrowing of the tunneled segment caused by the overlying myocardium. Moreover, the presence of concomitant Brefeldin_A atherosclerosis and stenosis in the coronary artery segment proximal to MB will aggravate myocardial ischemia.