Splenic rupture associated with anticoagulant therapy is a rare entity. We report a case of spontaneous splenic rupture in a 62-year-old man who was treated by acenocoumarol orally after an aortic-valve replacement. Unrecognised, minor trauma may lead to splenic haemorrhage in patients receiving anticoagulant therapy. The symptoms and signs may mimic those of acute myocardial infarction and cardiogenic shock. Early diagnosis is essential. Reversal of the anticoagulant and emergent splenectomy are the treatments of choice.