Infective endocarditis is a disease that is characterized by the vegetations. Although cardiac complications remain the leading cause of death, endocarditis is complex, systemic illness with involvement of virtually all the organs. The spectrum and incidence of cardiovasular, neurologic, renal complications also are presented by direct embolism and immune- mediated phenomena. Systemic embolism is the common and serious complications associated with infective endocarditis. Mycotic aneurysm by septic embolization is known complication of bacterial endocarditis, but mycotic aneurysm of superior mesenteric artery is very rare complication and approximately 10 cases has been reported in the literature. Acute hemorrhagic pericarditis is unusual clinical manifestation of bacterial endocarditis and subject to catastrophic hemodynamic compromise secondary to cardiac tamponade. We report a case of bacterial endocarditis in 23 years old male who developed acute hemorrhagic pericarditis and hemoperitoneum due to rupture of mycotic aneurysm in superior mesenteric artery with brief review of lieratures.