RESUMEN
Infective endocarditis (IE) refers to the pathogenic microbial infect the endocardium, valves or intima adjacent to the cardiac arteries through the bloodstream with the formation of vegetations. Valves are the most frequently affected sites. Here, we described a 49-year-old female, who admitted to respiratory outpatient department in the Third Xiangya Hospital, Central South University for long time of fever. Chest computer tomography (CT) found a thick wall cavity in the apex of the right lung with smooth wall and fluid plane, without enhancement, which was considered as inflammation and tuberculosis to be excluded. Echocardiography showed vegetations on the aortic valve, where abscess was found on the root. Accidentally in surgery, a patent ductus arteriosus (PDA) was found. The surgeon closed the PDA and performed aortic valve prosthetic valve replacement. Bacterial colony of coccus was found in the pathological tissue, which was consistent with the diagnosis of valvular degeneration with infection. Lung lesion was obviously absorbed after 6 weeks of treatment with vancomycin, which has been confirmed as a sensitive antibacterial drug to Enterococcus faecalis. Overall, the pulmonary lesion was caused by the detachment of bacterial neoplasm of aortic valve, which has passed through the PDA and entered the pulmonary circulation.