Introduction Fibrosing mediastinitis (FM) is a rare condition characterized by the proliferation of fibrotic tissue in the mediastinum, presenting as a concentrated mass or diffuse infiltration., Clinical conditions can range from benignity to obstruction of critical mediastinal structures, such as vessels, airways, and the esophagus. Common complaints are cough, dyspnea, recurrent pulmonary infection, hemoptysis, and pleuritic pain. Pericardial involvement is not frequently reported in the literature. In this article, we describe a rare case of major pericardial effusion with cardiac […]