American College of Cardiology/American Heart Association Lesion Complexity Score C

**Semantic type:** Finding

**Definition:** Diffuse (length greater than 2cm) or excessive tortuosity of proximal segment or extremely angulated segments greater than 90 degrees or total occlusions greater than 3 months old and/or bridging collaterals or inability to protect major side branches or degenerated vein grafts with friable lesions. (ACC)

**Synonyms:** - ACC/AHA LESION COMPLEXITY SCORE C - ACC/AHA Lesion Complexity Score C - High Risk