An Unusual Case of Seronegative Systemic Sclerosis and Cardiac Tamponade.

Systemic sclerosis (SSc) is an autoimmune rheumatic disease marked by excessive extracellular matrix deposition, causing fibrosis, endothelial dysfunction, and microvascular injury. There are two major types of SSc, limited and diffuse. SSc can affect any organ, leading to dysfunction and failure. The esophagus, kidneys, heart, and lungs are commonly affected. We report a case of a male patient who was diagnosed with scleroderma despite the absence of the classic antibodies and a subsequent presentation with cardiac involvement. This case highlights a rare presentation of seronegative SSc, emphasizing that diagnosis may extend beyond antibody testing. Additionally, it underscores the impact of cardiac involvement on patient morbidity and mortality.