A 45 year old male suffered from typical exercise-induced dyspnoea and angina. Crohn's disease treated with glucocorticoids was present for 18 years. Coronary angiography revealed small left anterior descending and right coronary arteries without reference to coronary artery disease, while the main stem and circumflex artery were severely dilated due to a fistula (diameter 5.5 mm) into the coronary sinus with a left/right shunt amounting to 35%. Haemodynamics, significant risk of endocarditis with chronic inflammatory bowel disease and obligatory glucocorticoid treatment were indications for fistula closure. As an alternative to surgical correction, the coronary fistula was totally occluded by antegrade micro-coil embolization. The present report offers a review on differential therapeutic considerations and specific treatment options including novel interventional modalities for coronary fistulas.