title: Left main ostial agenesis and right coronary artery occlusion: the importance of the 'Vieussens' arterial ring'.
authors: Cardiology Department, Santa Maria University Hospital, Lisbon Academic Medical Centre, CCUL, Hospital de Santa Maria, Avenida Professor Egas Moniz, Lisbon 1649-035, Portugal.
authors: Rui
authors: R
authors: Plácido
authors: Cardiology Department, Santa Maria University Hospital, Lisbon Academic Medical Centre, CCUL, Hospital de Santa Maria, Avenida Professor Egas Moniz, Lisbon 1649-035, Portugal.
authors: Ana G
authors: AG
authors: Almeida
authors: Cardiology Department, Santa Maria University Hospital, Lisbon Academic Medical Centre, CCUL, Hospital de Santa Maria, Avenida Professor Egas Moniz, Lisbon 1649-035, Portugal.
authors: Pedro
authors: P
authors: Canas da Silva
authors: Cardiology Department, Santa Maria University Hospital, Lisbon Academic Medical Centre, CCUL, Hospital de Santa Maria, Avenida Professor Egas Moniz, Lisbon 1649-035, Portugal.
authors: Fausto
authors: F
authors: Pinto
mesh_terms: D003097:Collateral Circulation / Q000502:physiology; D000072226:Computed Tomography Angiography; D054059:Coronary Occlusion / Q000000981:diagnostic imaging*; D003330:Coronary Vessel Anomalies / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male