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A 58-year-old man with rheumatic mitral and aortic stenosis underwent CT angiography for preoperative evaluation. No coronary atherosclerotic disease was present. Incidentally, an early branching of a large preventricular branch, as the first branch of the right coronary artery (RCA), was noted. The proximal part of preventricular branch was seen coursing cranially above the level of its ostium followed by a ‘U-turn’ to course caudally and supply the right ventricular myocardium (figure 1).
Shepherd’s crook configuration typically involves the main RCA (having a prevalence of 5%) where the RCA ostium is oriented superiorly and the proximal RCA courses upwards before making a U-turn to enter the right atrioventricular groove.1 Percutaneous transluminal angioplasty of lesions in ‘Shepherd’s crook’ RCA poses procedural challenges as steering the hardware across 180° turn is difficult and results in inferior primary success rates and greater complication rates.2–4 This case is unique as instead of RCA, an early preventricular branch is seen to have the ‘Shepherd’s crook’ configuration. Prior knowledge of this variant would prevent it being misdiagnosed as a ‘Shepherd’s crook’ RCA in the event of inadvertent selective cannulation of this early branch.
Shepherd’s crook configuration of a coronary artery is typically described where the ostium is oriented superiorly and the proximal artery travels upwards before making a U-turn to resume its normal course.
This configuration is most commonly seen involving the right coronary artery, but can also involve its branches.
Percutaneous transluminal angioplasty of lesions in arteries with Shepherd’s crook configuration poses procedural challenges as steering the hardware across the 180° turn is difficult and results in inferior primary success rates and greater complication rates.
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Contributors All authors participated sufficiently in the conception of the idea, development of the intellectual content, design, writing and final approval of the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
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