Placenta previa percreta is an abnormal placental implantation due to decidual deficiency. Placenta previa percreta with invasion of the urinary bladder is an uncommon and serious condition if not recognized before delivery. We report color Doppler ultrasound (CDUS) and magnetic resonance imaging (MRI) findings in two cases of placenta previa percreta with bladder invasion. Both cases presented with sudden painless vaginal bleeding and had previous cesarean delivery. CDUS and MRI findings are helpful for the prenatal diagnosis of plasenta previa percreta with invasion of the urinary bladder to prevent perinatal complications with this condition.