Vasa praevia is a term given when there are abnormal fetal vessels within the amniotic membranes that either cross or run in extremely close proximity to the internal cervical os. Pathology Vasa previa can be of two types type I (present in ~ .
Endometriomas, also known as chocolate cysts or endometriotic cysts, are a localised form of endometriosis and are usually within the ovary. They are readily diagnosed on ultrasound, with most demonstrating classical radiographic features.
Placenta Accreta - Multiple vascular lacunae (arrows) within the placenta at 18 weeks’ gestation. This finding has been reported with high sensitivity and a low false-positive rate for placenta accreta, which was the outcome for this pregnancy.