Effusive-constrictive pericarditis (ECP) is a rare clinical entity resulting from accumulating pericardial fluid within a stiff, non-compliant pericardium. There are a number of etiologies for ECP, which include malignancy, radiation, post-surgical causes, infectious, and collagen disorders. Clinically, ECP often presents as right-sided heart failure, or in advanced cases, cardiac tamponade. Symptoms may persist despite treatment with pericardiocentesis, and may warrant consideration for pericardiectomy for more definitive management. Invasive hemodynamic evaluation with cardiac catheterization remains the gold standard for diagnosis of ECP; however, echocardiography can provide a definitive diagnosis with high sensitivity and specificity. Echocardiographic features suggestive of ECP include ventricular septal motion abnormalities, such as interdependence, accentuated longitudinal motion of the heart, and altered respirophasic ventricular filling. While these features have been well established and can lead to the diagnosis of ECP, they are rarely observed in clinical practice. We present a case of ECP in a 25-year-old active duty male with a history of chest wall myoepithelial carcinoma who clearly demonstrated such echocardiographic findings of ECP.