What finding is indicative of placenta previa during ultrasound?

The presence of the placenta over or near the cervix during an ultrasound is indicative of placenta previa. In this condition, the placenta implants in the lower part of the uterus, potentially covering the cervical opening. This positioning can lead to complications during pregnancy and delivery, including bleeding and the necessity for a cesarean section.

In contrast, the other findings do not suggest placenta previa: a placenta located in the upper uterine segment is typically considered normal and not associated with the condition. A placenta attached to the uterine wall can also indicate a normal implantation site, while abnormal thickness of the placenta might point to other pathologies but does not specifically relate to placenta previa. Understanding these distinctions is crucial for proper diagnosis and management in obstetrics.