UT=Uterus, GS=Gestational sac, UB=Urinary bladder Figure 1: Transabdominal sonography image showing thick fluid-filled uterine cavity with a gestational sac surrounded by trophoblastic reaction in the anterior myometrium of the lower uterine segment. The sac measuring 16mm corresponding to 5weeks+6days

Figure 2: Spectral Doppler examination demonstrating the presence of fetal cardiac activity within the gestational sac

Figure 3: Sagittal T2-weighted imaging showing a gestational sac (white arrow) implanted within the anterior myometrium of the lower uterine segment in the region of the scar of previous cesarean section. The gestational sac shows a dot of fetal pole within and is surrounded by a thin decidual reaction (curved white arrow). The myometrium anterior to the gestational sac (black arrow) is thinned out. Posteriorly, the gestational sac is seen extending into the endometrial cavity in the lower uterine segment. The posterior myometrium shows good wall thickness. Note that the endometrial cavity filled with hematoma of different ages

Figure 4: Axial T2-weighted imaging showing a gestational sac (white arrow) implanted within the anterior myometrium of the lower uterine segment surrounded by a thin decidual reaction (black arrow)

Figure 5: Coronal T2-weighted fat suppression imaging showing a gestational sac (black arrow) implanted within the anterior myometrium of the lower uterine segment in the region of the scar of previous cesarean section. The gestational sac shows a dot of fetal pole at its lower aspect