Intramyocardial hematoma is a rare condition and is an incomplete form of myocardial rupture, which may occur after myocardial infarction, cardiac surgery, trauma, percutaneous coronary intervention, or spontaneously. We describe a case of a 16-year-old girl with intramyocardial hematoma mimicking an intracavitary thrombus following repair of Ebstein anomaly. The intramyocardial hematoma was incorrectly diagnosed on echocardiography as a right ventricular thrombus, and the true nature of the lesion was only realized during repeat surgical intervention for severe tricuspid regurgitation. The hematoma was managed conservatively and spontaneously resolved.