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A 67-year-old man underwent cardiac catheterisation after an equivocal exercise stress test. The left coronary tree was normal, but, despite using several catheters, the right coronary artery (RCA) could not be identified. A 30-degree left anterior oblique aortogram was performed (panel A). This demonstrated a very faint outline of the RCA (panel A, hollow arrow), but no clear origin was seen.