IFNG and tuberculosis: Tuberculous CP was considered based on imaging findings, positive interferon-gamma release assay, therapeutic response, and epidemiologic background.<h4>Interventions</h4>The patient was treated with anti-tuberculosis therapy without surgical pericardiectomy.<h4>Outcomes</h4>Follow-up imaging showed near-complete resolution of pericardial thickening and effusion, with sustained clinical improvement.<h4>Lessons</h4>This case highlights the value of cardiac magnetic resonance imaging in the early diagnosis of inflammatory CP and supports the role of medical therapy in selected patients.