title: Thebesian valve: the cause of unsuccessful retrograde coronary sinus cannulation.
authors.affiliation: Department of Anatomy, Jagiellonian University Medical College; Cracow-Poland. mkh@onet.eu.
authors.forename: Mateusz K
authors.initials: MK
authors.lastname: Holda
authors.forename: Mateusz
authors.initials: M
authors.lastname: Koziej
authors.forename: Wieslawa
authors.initials: W
authors.lastname: Klimek-Piotrowska
mesh_terms: D063405:Anatomic Variation; D002102:Cadaver; D006328:Cardiac Catheterization; D054326:Coronary Sinus / Q000033:anatomy & histology*; D006351:Heart Valves / Q000033:anatomy & histology*; D006801:Humans; D017211:Treatment Failure