Anterior vasa vasorum is a rare obstetric condition that presents with painless vaginal bleeding in mid- to late pregnancy and is easily misdiagnosed as placenta praevia or placental abruption, and the fetus dies as a result of delayed treatment.
As the pregnancy progresses, the area of abundant blood supply moves to the basal meconium, while the somites remain in situ, where the chorionic villi atrophy and become smooth, with the result that the umbilical cord is attached in the form of a sail, and the umbilical vessels extend to the edge of the placenta; in short, the umbilical cord occurs on the opposite side of the site of follicular implantation.
The manifestations of anterior vessels are varied, some rupture of anterior vessels occurs before rupture of membranes, rupture of membranes can occur before or during labor, sometimes blood clots are present at the time of rupture of the vessel, which may be a rupture of a small vein, after the hemorrhage, there is hypotension in the fetus and the flow of blood slows down resulting in a blood clot, therefore the bleeding stops, but the hemorrhage may reoccur in the future.
If prenatal diagnosis of anterior vessel is made, termination of pregnancy by cesarean section should be chosen at 37 to 38 weeks of gestation to avoid injury caused by rupture or compression of the anterior vessel; in case of rupture of anterior vessel the prognosis of the fetus is generally poor, and it is recommended to terminate the pregnancy by cesarean section immediately, and to prepare the blood aggressively and to resuscitate the neonate.
If you have any symptoms of physical discomfort, you should go to the hospital and consult your physician for guidance.