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Primary cardiac tumors exhibit a very low incidence, estimated between 0.001% and 0.03%. Among these, malignancies constitute a minority (∼25%), with sarcomas representing the vast majority (~95%) of such cases. Cardiac intimal sarcoma is among the rarest subtypes of primary cardiac sarcoma. This category of endocardial-based mesenchymal tumor typically originates in the great arteries and only infrequently develops within the heart itself. Their clinical behavior is notably aggressive, leading to a generally poor prognosis; consequently, the cornerstone of management is complete surgical excision with negative margins. This highlights the critical need for precise and early diagnosis to facilitate prompt intervention. This report details the case of a 20-year-old man with a prior history of Ewing sarcoma located in the left atrium, for which he had undergone previous cardiac surgery. In preparation for a subsequent procedure, hybrid imaging through 18 F-FDG PET/CT was utilized to characterize intracardiac masses, quantify tumor burden, and exclude the possibility of a new, extracardiac primary malignancy. Collectively, though drawn from limited case series and the present illustrative case, existing literature indicates that PET imaging provides supplemental diagnostic value beyond stand-alone CT or MRI. It enhances the evaluation of cardiac masses in both preoperative and posttherapeutic contexts. This integrated approach improves the determination of surgical candidacy and allows for the early detection of local or distant disease recurrence, which are pivotal components for structuring effective overall treatment strategies.