ABSTRACT

Objective:

Molar pregnancy coexistent with a live fetus can be a diagnostic and therapeutic challenge. With increasing incidence of multiple pregnancies, there has also been an increase in twin pregnancy with one mole in the recent years. The authors discuss the epidemiology, clinical presentation, and prenatal diagnosis and attempt to design a possible management strategy, to help guide the treating physician, in the management of partial mole with live pregnancy, thereby improving maternal and fetal prognosis.

Conclusion:

PMCF involves a high risk of bleeding, preterm labour, intrauterine growth restriction and stillbirth. Successful management of such cases needs prenatal diagnosis, antepartum surveillance and post-natal follow-up. An obstetrician, maternal fetal medicine specialist, gynecology oncologist and neonatal intensivist should be involved in the care of such pregnancies.

Results:

In total, 44 case reports of PMCF were analyzed. The mean gestational age at diagnosis was 20+6 (range: 10-40) weeks. Less than half (19/44; 43.2%) were asymptomatic at the time of detection and PMCF was detected on routine scan done for fetal well-being or 11-13-week scan. The majority (56.8%) resulted in the birth of a healthy live fetus. Gestational trophoblastic neoplasia developed in 3/44 (6.8%).

Material and Methods:

Numerous case reports have been published in various journals regarding management of individual cases of partial molar pregnancy coexistent with live fetus (PMCF). Therefore, we conducted a systematic review of all the case reports and short case series in English concerning partial mole with live pregnancy from 1999 to 2019, that is in the last 20 years.

Keywords:

Partial hydatidiform mole and coexistent live fetus, GTN, partial molar pregnancy, sad fetus syndrome

Introduction

A molar pregnancy coexistent with a live fetus, also known as sad fetus syndrome is a rare phenomenon with an incidence reported to be approximately 0.005-0.01% of all pregnancies (1). Molar pregnancy results from genetically aberrant conceptus. Usually, the complete mole has 46 chromosomes but all are of paternal origin, as an empty egg is fertilized by a sperm with duplicate genetic material. A partial mole usually results from dispermic fertilization of a haploid normal ovum resulting in a triploid zygote or monospermic fertilization with duplication of the paternal haploid chromosome, whereas the complete mole is result of fertilization of an empty ovum by a sperm (2). Though much rarer, there can be cases of mitotic abnormalities in the early post fertilization period, a form of placental mosaicism (3,4). USG in early pregnancy is the diagnostic tool to detect the majority of molar pregnancies. Though molar pregnancy can have varied presentation, most molar pregnancies present either as missed miscarriage or anembryonic pregnancy. Suction evacuation of products of conception followed by histopathology is confirmatory for diagnosis of a molar pregnancy (5). Women carrying a female fetus are more likely to have partial mole than mothers carrying a male fetus, with a ratio of 3.5:1 (1).

There is evidence in cases of twin pregnancy when one fetus dies in utero, the effect on the other fetus may be the immediate demise of the other twin, an effect on cognitive development of the surviving twin and/or effects on the maternal coagulation system. With the increasing incidence of multiple pregnancies, mainly as a result of assisted reproductive technologies, there has been an increase in the twin pregnancy rate with one fetus presenting as partial mole in the recent years. These pregnancies are considered high risk pregnancies and need thorough counselling (6). Though termination of pregnancy remains an option taking into account the high incidence of complications in these pregnancies, many women, especially those who conceive after years of infertility treatment, may choose not to go for termination. There should be informed decision making after providing adequate information about the chances of a live birth (about 50%) and risk of maternal and fetal complications (7). One of the major concerns in these women is the risk of gestational trophoblastic neoplasia (GTN), and whether this risk will increase further with continuation of pregnancy needs to be discussed with individual patients. GTN in general can have a varied clinical presentation and can present at variable interval of time after index pregnancy (8).

From the clinical perspective, pregnancy with partial mole can be of the following two types. The most common type is a dichorionic twin pregnancy with one sac containing a normal euploid fetus and placenta and the other sac containing the molar pregnancy, which can be either complete or partial mole. The other possibility is a singleton pregnancy with focal areas of degeneration affecting small to large placental areas (9).

It is very important but difficult to differentiate a singleton pregnancy with focal molar changes in the placenta from a twin pregnancy with one normal fetus and the other complete mole. A method which has been suggested to differentiate the two conditions is to follow the placental insertion site of the umbilical cord and, if it attaches to the molar placenta, it suggests singleton pregnancy with focal mole whereas if it attaches to a normal placenta it is more suggestive of twin gestation (10). Other important differential diagnosis of partial mole in case of twin pregnancy includes placental mesenchymal dysplasia (confirmed on histopathology) (11,12). Differential diagnosis also includes placental tumor, such as chorioangioma. However, this is usually a well circumscribed lesion with a different echogenicity from the rest of placenta, protrudes into the amniotic cavity, shows increased vascularity along with a feeding vessel with flow synchronous with the umbilical artery on Doppler (13).

Cases of partial mole with a coexistent live fetus (PMCF) present a diagnostic and management challenge to the treating obstetrician. Most of the literature available is in the form of case reports with varied presentation. Therefore, we performed a systematic review of cases of PMCF published in the last 20 years to examine the epidemiology, clinical presentation, prenatal diagnosis and to attempt to define a possible management strategy, to help guide the treating physician, thereby improving maternal and fetal outcome.

Material and Methods

This being a systematic review of case reports ethics committee approval was not sought as systematic reviews are exempted from ethics review.

An electronic search of Scopus, PubMed, Embase and other databases was conducted for case reports and case series of PMCF, published in English from 2000 to 2019. The electronic search strategy was done using keywords, such as “partial mole with live fetus” and “mole with live fetus”, “twin pregnancy with partial mole” and “hydatiform mole”, and “coexistent fetus” and “sad fetus syndrome” and “case reports”. We analyzed the title and abstracts of all case reports identified by the initial search. The reference lists of relevant reports were also explored. The data was double checked by two reviewers to avoid duplication.

The systematic review was planned and reported according to the preferred reporting items for systematic review and meta-analyses guidelines.

Published case reports and case series of partial mole coexistent with a live intra-uterine pregnancy at all gestational age were included in this systematic review. Case reports with complete hydatidiform mole coexistent with live fetus and case reports of partial molar pregnancy without live fetus were excluded. Review articles, original articles, clinical trials, conference abstracts, editorials, poorly described cases, articles in language other than English language or commentary were also excluded.

We extracted information, such as geographical distribution or country of occurrence of the case, year of publication, age of the patient at the time of presentation, gestational age at diagnosis, the time of delivery and the final outcome of the case in the form of live birth or abortion or induced termination and summarized it in a master chart. The various obstetric and medical complications that developed during the course of pregnancy were documented, such as miscarriage and gestational age at the time of miscarriage, pre-eclampsia and gestational age at which it developed, gestational diabetes, intra-uterine growth restriction, stillbirth, and preterm labor before 37 completed weeks of gestation. A note was also made of whether or not the patient developed GTN after termination of pregnancy and, if they did, the type of GTN and how long after termination of pregnancy GTN developed. Descriptive statistics was used to calculate simple frequency, percentage, and proportion out of the total case reports.

Results

A brief overview of the article screening process is shown in Figure 1. A total of 260 articles were identified on initial electronic database search, of which 41 articles, with a total of 44 cases of PMCF were included in the final analysis.

Discussion

We present here a comprehensive systematic review of published case reports of PMCF in the last 20 years. There were only 44 such cases worldwide published in English, over a period of 20 years, suggesting the rarity of this entity. Therefore, this systematic review will help to aid in understanding the epidemiology, clinical presentation, and prenatal diagnosis and may help to identify a possible management strategy.

Most cases (55%) were reported from Asia. This correlates with the geographical distribution of molar pregnancy. The incidence of molar pregnancy is higher in Asia, compared to Europe and North America (9). This epidemiological distribution might be affected by the reporting system of each country.

The most common presenting complaint was vaginal bleeding, although it affected less than a third of cases. This correlates with the large placental size, cystic changes in the placenta and the non-viability of the molar tissue. The bleeding in these cases may present at any time during pregnancy. In our case series, the earliest presentation was in the first trimester as missed miscarriage associated with vaginal bleeding and patients presented in the late third trimester with antepartum haemorrhage. Bleeding in the first or second trimester of pregnancy is one of the most common complications in such cases. Bleeding at any time may prove life threatening for the mother, thereby necessitating urgent delivery (14). The large size of placenta also increases the chances of placenta previa (15) and other placental abnormalities, such as circumvallate placenta. Ante-partum and post-partum hemorrhage necessitating massive transfusions or even emergency hysterectomy has been reported.

Clinical presentation may be diverse. Less than half of the cases (43%) in the present systematic review were diagnosed incidentally as a result of routine USG done in early weeks of gestation. Hyperemesis, early onset preeclampsia and eclampsia (16,17), hyperthyroidism (11), unexplained intrauterine fetal demise (18) or fetal growth restriction, preterm labor or premature rupture of membranes (6), and pain in the lower abdomen, were the other presenting complaints. Rarely, cases attracted clinical attention due to positive first trimester screen or detection of cystic hygroma or fetal hydrops on USG examination (19,20). Partial mole may be detected incidentally on gross or pathologic examination of the placenta. There should be a high index of suspicion in cases with fetal or neonatal anemia or unexplained intra uterine death of fetus (21). Rarely, PMCF was reported to be complicated by progressive anemia (22) or respiratory distress (23).

Cystic changes in the placenta or placentomegaly are one of the earliest USG findings that attract attention. A large sized placenta also predisposes to placenta previa and even cases of morbidly adherent placenta necessitating emergency peripartum hysterectomy have been reported (24). There was one case of one patient undergoing peripartum hysterectomy and internal iliac artery ligation for antepartum haemorrhage associated with placenta accreta.

Although USG is the initial modality of choice for the diagnosis of molar pregnancy, the sensitivity is only 40-60% (25). Detection rate on USG is higher for complete moles than for partial moles, as most partial moles may be mistaken sonographically as missed or incomplete abortions in early pregnancy, as the appearance is quite similar (26,27). However, the following features on USG have been said to be suggestive of partial mole:

a. thickened placenta with hypoechoic areas (11);

b. absent or low venous flow inside the placental lesion, especially during the first two trimesters, helps to differentiate it from chorioangioma or complete mole (28);

c. increased echogenicity at the maternal fetal interface;

d. altered gestational sac diameter ratios, cystic changes in the placenta or snow storm appearance (28).

The definitive diagnosis of partial mole can be established only by a pathological examination of the placenta (29). Immunohistochemical analysis for p57 protein, which is expressed only from the maternally derived antigens, may be helpful to differentiate partial from complete mole, especially in cases that are difficult to diagnose by USG alone. This is becoming increasingly important as with earlier diagnosis and therapeutic termination, the differentiation of molar from non-molar pregnancy has become difficult. As complete mole lacks a maternal genome, p57^KIP2 immunostaining will be absent, whereas hydropic abortuses and partial mole show positive staining. Positive p57 staining has high sensitivity and specificity to exclude the diagnosis of complete mole (30,31). So, p57 staining complements the ploidy studies to refine the diagnosis of early molar pregnancies.

The diagnosis of PMCF can also be suspected on the basis of abnormal prenatal screening testing results. Single nucleotide polymorphism-based, non-invasive prenatal testing has the potential to detect uniparental diosomy, which is the hallmark of complete molar pregnancy (32), and can also detect cases of both diandric or digynictriploidy, characteristic of partial mole (33,34).

Preeclampsia is thought to be mediated by circulating factors of placental origin, mainly sFlt-1 and S-endoglin. The sFlt-1: placental growth factor ratio are also usually extremely high and are one of the factors implicated in early onset preeclampsia before 20 weeks of gestation (17).

Live birth rate was 56.8%, whereas intrauterine death was reported in 20% of cases. Pregnancy was terminated in 27% due to excessive vaginal bleeding. Mode of delivery depends upon the maternal and fetal condition. In published cases, CS was performed mainly for antepartum hemorrhage. One patient required emergency hysterectomy and internal iliac artery ligation due to associated bleeding with placenta accreta.

Cases of PMCF are at high risk for developing GTN, which occured in 7% of the cases reviewed. All three patients developed choriocarcinoma which completely responded to chemotherapy. Histopathological examination of placenta and strict follow-up with β-hCG monitoring is necessary for timely identification of the development of GTN and the success of treatment.

The decision to continue pregnancy is very much dependent on the karyotype of the fetus. The best method to determine the fetal karyotype still remains controversial. Although chorionic villus sampling has an advantage of diagnosis at an earlier gestational age, it may not be diagnostic of the fetal karyotype due to confined placental karyotype aberration. Amniocentesis remains the diagnostic test of choice. Therefore, USG guided placental biopsy, fetal karyotype by either amniocentesis or fetal blood sampling, combined with serum monitoring for β-hCG should be used to guide decision making (15).

Conclusion

PMCF should be considered as a high-risk pregnancy. A high index of suspicion is required for timely diagnosis and successful management. Prenatal diagnosis and counselling, strict antepartum surveillance and adequate post-natal follow-up play a vital role in optimal maternal and fetal outcome. An obstetrician, maternal fetal medicine specialist, gynecologic oncologist and neonatologist should be involved in the care of such a pregnancy.

Demographic characteristics

The geographic distribution of cases is shown in Figure 2 with the age distribution shown in Figure 3. The majority of the cases reported were aged between 26 and 30 years. This also represents the age when most pregnancies happen. The mean gestational age at diagnosis was 20+6 weeks ranging from 10-40 weeks.

Clinical manifestations

Less than half of the cases (19/44, 43.2%) were asymptomatic at the time of diagnosis and were detected incidentally during routine ultrasonography (USG) scan done for fetal well-being or at 11-13^th week combined screening test. The diagnosis was made as early as 10 weeks of gestation in two patients because of the appearance of multiple cystic spaces in the placenta. Interestingly, both these patients were women with Turner syndrome mosaicism and pregnancy was a result of intracytoplasmic sperm transfer in both. False positive first trimester screen for Down syndrome and cystic hygroma at 11-14^th week scan and hydrops raised suspicion in two cases. The most common clinical manifestation (13/44; 29.5%) that caused suspicion and eventual diagnosis was vaginal bleeding. Nine (69%) had bleeding in the first trimester and presented with threatened miscarriage. Two (15.4%) had vaginal bleeding in the second trimester and two further patients presented with ante-partum hemorrhage in the third trimester. Preeclampsia and eclampsia (5/44; 11.4%), hyperemesis (3/44; 6.8%) and hyperthyroidism (2/44; 4.5%) were other common manifestations. One patient was diagnosed due to progressive anemia as a result of feto-maternal hemorrhage. Preterm labor, intrauterine fetal demise and vanishing twin were the presenting clinical manifestations in one case each, which raised suspicion leading to diagnosis of partial mole (Figure 4).

Diagnosis

Of 44 cases, the diagnosis was made on USG examination in 36 (81.8%). In approximately 43% of cases (19/44), it was an incidental finding on routine USG examination, while others were detected on a detailed examination done due to vaginal bleeding or cystic hygroma, hydrops, placentomegaly or unusual elevation in the levels of beta-human chorionic gonadotropin (β-hCG). Four cases were detected only on the pathological examination of the placenta after delivery. The presence of grape-like vesicles or cystic areas in the placenta on gross examination, fetal growth restriction or unexplained fetal anemia due to feto-maternal hemorrhage raised suspicion, thereby prompting histopathology. On gross examination, the partial mole was focal in 11 cases and did not involve the entire placenta.

Out of 44 cases, the karyotype of the fetus was normal in 29 (65.9%). Among those with abnormal fetal karyotype, one fetus had trisomy 21, one had monosomy X, two had triplody and in three patients, although the placenta was triploid, fetal karyotype was diploid. One case of Dandy-Walker malformation was also reported with diploid fetus. Karyotype was not done or not mentioned in 11 patients.

The structural congenital anomalies associated were cystic hygroma, omphalocele, hydrocephalus, meningomyelocele, spina bifida, congenital talipes equinovarus and hypospadias.

Fetal and maternal outcome

Figure 4 illustrates the major maternal and fetal complications seen in cases of partial mole with one live fetus. Twenty-five (56.8%) resulted in live birth, athough there was one case of early neonatal death. Two babies were born with severe anemia and required multiple transfusions after birth, but survived. One baby died after 65 days of life due to respiratory failure because of hyaline membrane disease and severe hypothermia. Intra uterine death of fetus was reported in six cases, and pregnancy was terminated in 12 cases mainly due to excessive bleeding complications.

Thirteen patients delivered vaginally, nine out of these after 34 weeks of gestation. Four were preterm deliveries: two patients went into spontaneous preterm labour at 28 weeks, one at 30 weeks of gestation and one woman delivered at 24 weeks due to vaginal bleeding followed by preterm labor. Twelve patients were delivered by Caesarean section (CS), the most common indication for CS being excessive vaginal bleeding or antepartum hemorrhage. Ten out of these 12 CSs were done preterm, from 26 to 32 weeks of gestation. Other common indications for CS were severe growth restriction, compromised Doppler and prematurity. In 11/12 (91.7%), the birth weight was less than 10^th centile with four out of these having birth weight less than 3^rd centile.

One patient underwent emergency hysterectomy and internal iliac artery ligation as a consequence of excessive haemorrhage associated with placenta accreta in a woman with PMCF. Theca lutein cysts were found in 4/44 (9.1%). Two out of 44 (4.5%) developed hyperthyroidism that was managed medically with propylthiouracil in both.

Follow-up

Complete β-hCG follow-up was not mentioned in all cases. The duration from pregnancy termination until undetectable β-hCG values was available for 21/44 cases. GTN was reported in 6.81% (3/44). All three patients developed choriocarcinoma which responded completely to chemotherapy. Persistently raised β-hCG on follow-up, associated with vaginal spotting, was the main presentation, which led to the diagnosis of GTN. The time duration between termination of pregnancy and development of GTN was one month in two cases and two months in the third case. There was no sign of residual disease or recurrence in any of these three patients after completion of chemotherapy (Table 1).

Sixteen case reports mentioned about follow-up after normalization of β-hCG values. Duration of follow-up was five years in one, two years in three, one year in seven and six months or less in the remaining five cases reports. Four case reports mention follow-up until time of publication, but this makes it difficult to estimate the actual follow-up duration as publication delay was unknown (Table 1).

Management strategy

Sad fetus syndrome, or live pregnancy with coexistent mole is a rare entity, yet poses a great diagnostic and management challenge to the obstetrician. Here we propose a management plan on the basis of the available evidence obtained from this literature review.

A high index of suspicion should be kept in all cases at extremes of age, in mothers of Asian origin, women with multiple pregnancies, those who conceived by assisted reproductive methods or those presenting with bleeding in early pregnancy. A USG examination of both the fetus and placenta should be performed. All cases presenting with cystic changes in the placenta should have a detailed examination to see whether the changes are focal or complete and whether a live fetus coexists with a molar pregnancy. Cord insertion should be looked for, if it inserts on the cystic placenta, a focal mole is more likely and if the cord inserts on a normal placenta, a twin pregnancy with coexistent mole is an option. Women should be counselled about all the complications that can develop during the course of continuing this pregnancy, including the risk of GTN, and need for chemotherapy if it occurs. The risk of triploidy and congenital anomalies in the fetus, preterm labor, fetal growth restriction, intra uterine fetal demise, ante-partum or post-partum hemorrhage any time necessitating urgent delivery or peripartum hysterectomy should also be discussed with the patient.

Factors that should be kept in mind when counselling patients regarding fetal prognosis include the karyotype of fetus (6), parity of the woman, coexistent obstetric and medical complications and the rate of degeneration of molar tissue.

If the patient decides to continue with the pregnancy, these patients might need multidisciplinary care throughout the pregnancy. An obstetrician, maternal fetal medicine specialist, gynecologic oncologist and neonatologist should be involved in the care of such a pregnancy.

An amniocentesis at around 16 weeks to determine fetal karyotype, detailed USG to rule out any congenital abnormalities in the fetus, including fetal echocardiography, should be offered. Serial scans for fetal growth may be needed every 2-3 weeks, as these fetuses are very high risk for fetal growth restriction and oligohydramnios. These fetuses should be under strict surveillance for impaired circulation due to abnormal development of villi; they are at very high risk for sudden death or still-birth. These women are at risk of torrential life-threatening hemorrhage at the time of delivery. Therefore, all necessary preparations should be made beforehand. If an elective CS is planned, especially in the setting of previous two or three Caesareans, pre-operative balloon catheters in the uterine or internal iliac arteries might be needed in order to minimize blood loss. Uterine artery embolization has a role in cases of excessive hemorrhage associated with molar pregnancy (35). An adequate amount of blood should be cross matched and be available at the time of delivery, should the need arise.

Even after delivery, the patient needs weekly β-hCG monitoring for early diagnosis and management of post molar GTN and single additional confirmatory normal β-hCG measurement one month after the first normalization of β-hCG after a partial mole and for at least six months after a complete mole (36).

Study Limitations

The present systematic review provides the most recent and comprehensive overview of epidemiology, clinical manifestations, prenatal diagnosis and management in cases of PMCF. All globally published cases in English have been identified by extensive electronic database searches. However, the data was heterogeneous, and the analysis was descriptive, which are limitations of this systematic review. Case reports and case series published in other languages were not included, which might be another limiting factor.

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Partial mole with coexistent live fetus: A systematic review of case reports