Central venous catheters are commonly used in clinical practice. Right atrial thrombosis is a relatively common complication associated with indwelling catheter use. Thrombosis can be in different locations and forms within vascular and intracardiac structures. Echocardiographic images may mimic some anatomic and pathologic variants. We describe a case of a two-months-old girl with a thrombus which cor triatriatum dexter-like appearance in the right atrium due to the central venous catheter.