Around 50% of large chorioangiomas cases develop fetal and maternal complications that required either elective delivery or intervention for tumor-related effects [
9].
Chorioangiomas may act as peripheral arteriovenous shunts, leading to increased cardiac output, cardiomegaly and finally heart failure and hydrops, additionally complicated by fetal anemia in some cases [
2-
6]. When complications appear late in pregnancy, the best option is delivery. However, complications may appear earlier and delivery may be a problem due to fetal prematurity. Thus, different interventions have been proposed to prevent fetal loss related to large fetal chorioangioma complications. Amniodrainage for alleviating polyhydramnios [
3,
5,
7] and intrauterine transfusions in the presence of fetal anemia are two of the most common therapeutic procedures [
7,
10-
12], although results are favorable, the problem that causes increased peripheral flow through the chorioangioma, it is not solved with amniodrainage or fetal transfusion. For that reason, other approaches have been used to stop vascular supply to the tumor and consequent heart failure. In addition to amniodrainage or fetal transfusion, different techniques have been used as injection of absolute alcohol [
13-
15], endoscopic laser coagulation [
16,
17], and interstitial laser therapy [
4,
7], endoscopic suture with bipolar electrosurgery [
18], and microcoil and embucrilate embolization, the last two procedures without survivors [
9,
13,
18]. Table summarize a literature review of therapy (excluding amniodrainage alone) and the presence/absence of hydrops as well as other complications in chorioangioma cases. When analysing the overall results of intraturine interventions, it is also remarkable that mortality in cases without fetal hydrops is 10%, while mortality in cases with fetal hydrops raises to 67%. In fact, all successful intersticial laser procedures [
4,
7] were performed to prevent the development of fetal hydrops.
| Table 1Literature review of therapy (excluding amniodrainage alone), presence/absence of hydrops, and other complications in giant chorioangioma cases |
Mirror syndrome (Ballantyne’s syndrome) is usually defined as maternal edema associated to fetal hydrops [
19]. Different fetal conditions have been related to mirror syndrome, although pathogenesis and pathofisiology of Ballantyne’s syndrome is currently unknown [
19]. Mirror syndrome associated to large placental chorioangiomas has been described only a few times [
20-
23] and maternal edema has been always present, as was in our case. In addition, other clinical markers also been reported as oliguria, anemia, elevated liver enzymes, hypoproteinemia and hypokalemia were also present in our patient. Additional clinical signs and symptoms described in Mirror syndrome related to large chorioangiomas such as elevated blood pressure, proteinuria, elevated uric acid and creatinine, headache and visual disturbances, and low platelets were absent in our case, which made easier differential diagnosis with preeclampsia. As described elsewhere [
19] mirror syndrome disappears shortly after fetal hydrops successful treatment, pregnancy termination or delivery, as in the patient presented here.