Arsalan Vakili - Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran
Mohammad Eftekhari - Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran
Armaghan Fard-Esfahani - Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran
Reza Vali - Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran
Siamak Derakhshan - Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran
Mohsen Saghari - Research Institute for Nuclear Medicine, Tehran University of Medical Sciences, Tehran, Iran

Mycotic aneurysm is an uncommon but very important complication of subacute infectious endocarditis. It is usually asymptomatic but often causes sudden and massive bleeding with high mortality rate. ۹۹mTc-RBC scan is a noninvasive method for detection of mycotic aneurysm throughout the body. In this report two cases with mycotic aneurysm are presented and the usefulness of ۹۹mTc-RBC scan in diagnosis of this disease process is discussed.