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Purpose of Review: : This review aims to explore the clinical significance of atrial fluorodeoxyglucose (FDG) uptake observed in positron emission tomography (PET) scans, focusing on its association with atrial fibrillation (AF), cardiac sarcoidosis, and myocarditis. We discuss the implications of atrial uptake for patient management and prognosis. Recent Findings: : Recent studies have demonstrated that atrial FDG uptake is frequently present in patients with AF, particularly those with persistent AF, and is linked to increased risks of stroke and poorer outcomes after ablation. In cardiac sarcoidosis, atrial uptake correlates with inflammation and an elevated risk of AF. Additionally, non-granulomatous myocarditis has been associated with localized atrial FDG uptake, necessitating careful differentiation from other causes. Summary: : Atrial FDG uptake reflects underlying pathological processes such as inflammation, which can significantly impact patient management and outcomes across various cardiovascular diseases. Recognizing these findings can facilitate early intervention, improve prognosis, and support the development of clear guidelines for clinical practice, emphasizing the need for continued research in this area. [ABSTRACT FROM AUTHOR]