title: Angiographically visible intercoronary collateral circulation in the absence of obstructive coronary artery disease.
mesh_terms: D000792:Angiography; D003097:Collateral Circulation; D017023:Coronary Angiography; D003327:Coronary Disease / Q000000981:diagnostic imaging; D003331:Coronary Vessels; D005260:Female; D006801:Humans; D008875:Middle Aged