Arteriovenous malformation(AVM) of female pelvic organ is a rare disease of unknown cause. The authors reporta case of pelvic AVM which was incidentally found during US examination of the patient with choriocarcinoma afterchemotherapy. The real-time sonography revealed several cystic lesions around the uterus with adjacent dilatedtortuous vessels. The color Doppler sonography depicted abundant blood flow mixed with red and blue colors withinthe cystic lesionsn and rapid turbulent systolic and diastolic flows. CT showed well-enhancing round vascularlesions with elongated vessels in the pelvis, and MRI depicted signal-void cystic lesions on both T1 and T2weighted images with small portions of high intensity within the lesions on T2 weighted image. The angiographyrevealed pelvic AVM fed by tortuous uterine and vaginal arteries with a dilated draining vein.