NHLBI Coronary Artery Dissection Type A

**Semantic type:** Qualitative Concept

**Definition:** Minor radiolucencies within the lumen during contrast injection with no persistence after dye clearance. (Adapted from: Coronary artery angiographic changes after PTCA: Manual of Operations NHLBI PTCA Registry 1985-6:9)

**Synonyms:** - CORONARY DISSECTION NHLBI GRADE A