Management of Cervical Ectopic Pregnancy: A Case Report from Cali, Colombia

Enrique HC1*; Jessica SS2; Luisa MND3; Juan MTP3

¹Department of Gynecology and Obstetrics, Coordinator of the Endocrinology and Infertility Area, , Universidad del Valle, and Reproductive Medicine Unit, Clínica Imbanaco.
²Specialist in Reproduction and Gynecological Endocrinology, Reproductive Medicine Unit, Imbanaco Clinic.
³Fellow in Reproductive Medicine, Clínica Imbanaco, Universidad del Valle.

*Corresponding author

Enrique HC, Department of Gynecology and Obstetrics, Coordinator of the Endocrinology and Infertility Area, , Universidad del Valle, and Reproductive Medicine Unit, Clínica Imbanaco.

Introduction

Non-tubal ectopic pregnancy (EE) accounts for 5% of pregnancies, and cervical ectopic pregnancy (CEP) accounts for up to 0.1%, with unknown etiology and sometimes life-threatening (1,2,3). The first case was reported by Schneider in 1817.

Later, in 1911, Rubin published the histological criteria for its diagnosis; in 1959, Palmar and McElin described the clinical criteria, and Ushakov described the diagnostic ultrasound criteria in the 1990s (2,4,5). In Colombia, Velez and Tamara reported one case of cervical ectopic pregnancy, corresponding to 1.2% of cases in a series of 82 patients between 1993 and 1998. Among other reported cases, in 2011, Herrera et al. reported a series of four cases of heterotopic pregnancies during in vitro fertilization procedures. One of these cases included a heterotopic pregnancy with EEC managed with cervical aspiration and intracytoplasmic injection of potassium chloride, with continued intrauterine pregnancy (6,7).

EEC is recognized as a gestation with implantation of the blastocyst in the cervical mucosa below the internal cervical os, and the trophoblast can invade the cervical wall and reach the uterine vasculature, causing bleeding in the event of rupture in up to 70% of cases (8). Risk factors described for EEC include: previous curettage, uterine and cervical synechiae, IUD, previous cervical surgery, previous cesarean section, pelvic inflammatory disease, uterine malformations, assisted reproductive techniques, and chronic endometritis. (2)

Diagnostic criteria include: intracervical location of the gestational sac; closed OIC; local invasion of endocervical tissue by trophoblasts; visualization of embryonic structures; empty uterine cavity; endometrial decidualization; intracervical peritrophoblastic arterial flow; hourglass-shaped uterus; barrel-shaped dilated cervical canal; and absence of the sliding sign (5,13).

The main differential diagnosis for EEC is an ongoing abortion during passage through the cervical canal or an endometrial polyp, which can cause delays in diagnosis and treatment (9).

Radical treatments such as abdominal hysterectomy have been described, but currently, management is more conservative, with procedures such as methotrexate (MTX) administration, angioembolization, hysteroscopic resection, or endocervical packing, which can be used together, always seeking to preserve fertility (10,11,12).

The following is a clinical case of a patient with EEC treated at a Level IV clinic in Cali, Colombia. The patient underwent timely imaging diagnosis of EEC and conservative medical treatment, with a successful outcome in the effort to preserve the patient's fertility.

Clinical Case

A 42-year-old patient, G3A2, with a desire for fertility, a history of missed abortion at 8 weeks requiring obstetric curettage, and a genetic study that reported Trisomy 11 and Trisomy 13. Family planning and genetic testing were indicated for the couple to determine an Assisted Reproductive Technology (ART).

One month later, she presented with dark vaginal bleeding. She was hemodynamically stable. Physical examination revealed no abdominal pain or active vaginal bleeding. Vaginal examination revealed an anteverted flexion (AVF) uterus slightly enlarged for 6 weeks, with a short cervix, and a beta-human chorionic gonadotropin (BHCG) of 24,246 mIU/ml. A transvaginal ultrasound (TV) was performed, which reported: Homogeneous endometrium with no evidence of an intrauterine gestational sac; hourglass sign; pregnancy implanted at the isthmic- cervical level, with no sludge sign; embryo with present cardiac activity and cephalocaudal length (CCL) for a 7-week pregnancy (Image 1).

Given the clinical and ultrasound findings, a diagnosis of EEC was made, and taking into account the patient's reproductive desire, conservative medical management was decided in order to preserve fertility, explaining the risk of ending in a definitive surgical procedure (hysterectomy).

Figure 1: An embryo with positive cardiac activity is observed in the cervical canal

Figure 2: Verification of the operation of the Cook probe balloons 

Figure 3: The Cook Balloon is observed in the cervical canal

Table 1: BHCG level monitoring 

Liver function tests (AST 25 IU/L, ALT 30 IU/L), and renal function tests (creatinine 0.75 mg/dL) were performed prior to treatment with MTX (Disodium Methotrexate, Alfarma, Czech Republic, INVIMA 2007M-0006795) at a dose of 1 mg/kg. Considering the patient's BHCG levels (greater than 10,000 mIU/ml), it was decided to administer an interdaily MTX protocol with intramuscular administration on days 1, 3, 5, and 7, alternating with folinic acid at a dose of 0.1 mg/kg intramuscularly on even-numbered days.

The BHCG level 48 hours after MTX administration was 38,000 mIU/ml, and at 96 hours, it was 54,213 mIU/ml.

An ultrasound examination revealed an elongated gestational sac implanted in the endocervical canal, measuring 49x8x12 mm, with multiple mixed echocardiographic images consistent with hematomas, and an 11 mm embryo with cardiac activity. Complementary treatment was performed with an ultrasound-guided double-balloon catheter (Cook). 30 cc of distilled water was instilled into both airways to verify proper function (Image 2).

Under abdominal ultrasound guidance, 30 mg of MTX were administered vaginally with ultrasound-guided puncture at the saccular level and dilation of the internal cervical os (IO) was performed with a hysterometer and Hegar dilators (#2-4) without achieving passage to the uterine cavity in order to place the Cook double-balloon catheter., presenting profuse bleeding of approximately 500 cc, for which the cervical canal was explored obtaining a moderate amount of remains which were sent to pathology study; Cook catheter was placed at the level of the cervical canal and insufflated with 40 cc of distilled water, under ultrasound vision, reducing bleeding by 95%. The catheter was fixed at the hypogastrium level in order to avoid traction with movements of the lower limbs (See image 3).

In addition, a urinary catheter was left in place to monitor diuresis, given the profuse bleeding. Prophylactic antibiotics were used and a complete blood count and PCR were taken every 24 hours during the first 4 days, with quantitative BHCG monitoring and ultrasound follow-up.

The patient's progress was satisfactory, with minimal vaginal bleeding and decreased BHCG levels (see Table 1). A Doppler ultrasound was performed 3 days after Cook tube insertion. There was no evidence of ovulation remnants or color Doppler enhancement, so the Cook tube was removed. The patient was observed for 24 hours and discharged with instructions for BHCG monitoring and a Doppler ultrasound in 5 days. Family planning recommendations were received until the results of the genetic study of the pathology were known, in order to determine genetic and reproductive counseling.

Discussion

The therapeutic approach to CEE depends on the patient's reproductive desire; conservative treatment is controversial and depends on the timing of diagnosis and hemodynamic status (14). If the diagnosis is made before the 12th week of gestation, it has a resolution rate of 60–90% and fertility preservation in up to 90% of cases (15).

The criteria for conservative management are: ultrasound diagnosis of cervical ectopic pregnancy, hemodynamic stability, gestational age less than 10 weeks absence of vaginal bleeding or light bleeding, normal platelet count, and normal liver and kidney function (5,22).

Conservative medical management consists of the use of MTX in single or multiple doses in association with interventions such as cervical tamponade with cervical ripening probes (Cook), curettage, cervical cerclage with intrasaccular injection of vasoconstrictor agents, uterine artery ligation, hysteroscopic endocervical resection, uterine artery embolization (17,19,20). MTX is administered in a multiple-dose regimen at 1 mg/kg on days 1-3-5-7 alternating with folinic acid 0.1 mg/kg on days 2-4-6-8, with monitoring of BhCG between days 4 and 7, with an expected decrease of 15% in BhCG levels to be considered therapeutically effective. (2,14) In our case, multiple doses of MTX were administered, but therapeutic efficacy was not achieved due to very high BhCG levels above 10,000 mIU/ml and an embryo with cardiac activity, as described by Hung et al. (16,21, 23, 24).

In our case, after ultrasound-guided intrasaccular MTX placement and the use of a small Foester forceps to extract ovary remnants from the cervical canal, blood loss of approximately 500 cc occurred. This was stopped with a double-balloon catheter (Cook). The first balloon was inflated at the level of the cervical canal due to the difficulty of passing it intrauterinely. This measure reduced bleeding by 95%, thus avoiding aggressive management as described in the literature for hysterectomy in 70% of patients (24,25).

This approach could be applied to a regular #18 Foley catheter model that could be inflated with 40-45 cc of distilled water, and a double-balloon catheter would not be necessary, since this is not readily available in all centers and is only found in level IV institutions. Broad-spectrum prophylactic antibiotics, such as second-generation cephalosporins, are also recommended, as is the introduction of a urinary catheter to reduce the risk of spontaneous expulsion of the catheter from the cervical canal, monitoring of hemoglobin and hematocrit every 24 to 48 hours depending on bleeding, a reserve of blood products, and strict monitoring of BhCG and vital signs.

Conclusion

EEC is a rare condition; its diagnosis and management pose a challenge for patients who wish to preserve their fertility. Treatment with IM methotrexate in combination with folinic acid becomes an appropriate option in certain patients who meet the application criteria; the other group may require additional procedures such as endocervical dilation and packing using a #18 Foley catheter, the balloon of which is recommended to be inflated with 40 cc of distilled water, as demonstrated in our case.

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