Background
Intramyocardial dissecting haematoma is a rare and potentially life-threatening complication of myocardial infarction (MI). Only a few isolated cases have been reported so far.

Case summary
We report the case of a patient with a large, obstructing intramyocardial haematoma of the ventricular septum following MI due to plaque rupture of the right coronary artery (RCA) and following successful coronary intervention. The clinically inapparent haematoma was discovered during routine echocardiography and confirmed by both computed tomography (CT) and magnetic resonance imaging (MRI). With non-surgical treatment, the patient remained clinically stable. Repeated echocardiography showed gradual regression of the haematoma. Follow-up echocardiography 3 months after the initial diagnosis demonstrated no evidence of septal haematoma.

Discussion
This report suggests that even large intramyocardial haematoma may recede without operative intervention. Echocardiography, CT, and MRI are all helpful in quantifying the size of the haematoma. The appropriate management should be patient-oriented, depending on clinical stability and progression of the haematoma. Conservative treatment in clinically stable patients suffering from septal haematoma following MI and coronary intervention can be a feasible option.