Baseline angiography found chronic total occlusion (CTO) of right coronary artery (RCA) and borderline ostial LM lesion. Visualized best in cranial projections. Caudal projections do not reveal LM disease.
Baseline HD IVUS
Baseline HD IVUS measurements - MLA: 11.06 mm2
Based on HD IVUS measurements the ostial LM lesion was not significant and was left untreated
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Baseline cranial projection of borderline Ostial LM lesion 
Baseline HD IVUS measurements - MLA: 11.06 mm2 
Baseline HD IVUS of borderline Ostial LM lesion 