Introduction Primary cardiac tumors are rare, and their clinical presentation ranges from incidental discovery on imaging tests to life-threatening presentations.– We report a case of a young female with a history of atrial fibrillation (AF) who was found a left atrial mass in an elective cardiac computed tomography performed before AF-ablation and was qualified for surgical resection of the mass. A pathological exam revealed a primary undifferentiated pleomorphic cardiac sarcoma. […]