Right atrial mass after cardiac arrest: A case report and brief literature review

Although thrombotic events are common complications after cardiac arrest, the rapid formation of intracardiac thrombi is rarely directly observed. Here, we report a 57-year-old male who underwent laparoscopic bladder flap ureteral replacement surgery for a right ureteral fistula. During the surgery, indocyanine green was injected into the ureter, resulting in sudden respiratory and cardiac arrest. Immediate cardiopulmonary resuscitation was initiated, and transesophageal echocardiography revealed right atrial mass formation. After cardiopulmonary resuscitation, the patient's vital signs remained stabilized. Repeat cardiac ultrasound demonstrated rapid mass resolution. The patient was successfully extubated in the intensive care unit and was subsequently discharged without complications. This case directly documents the rapid formation of intracardiac mass following cardiac arrest, highlighting the need to promptly rule out thrombotic events after successful resuscitation to enable timely management.