Primary Hepatic Ectopic Pregnancy: Diagnosis and Laparoscopic Management

OBJECTIVE

To demonstrate and discuss a case of primary hepatic ectopic pregnancy and laparoscopic management.

DESIGN

Case presentation with demonstration of surgical hepatic wedge resection.

SETTING

Tertiary referral center in Manchester, United Kingdom.

INTERVENTIONS

A 33-year-old women gravida 13 para 2 with a body mass index of 55 kg/m2 and previous 2 cesarean sections and a laparoscopic cholecystectomy presented to the emergency services after a private ultrasound scan showing a pregnancy of unknown location and a serum human chorionic gonadotropin (hCG) of 18 336 IU/mL. A diagnostic laparoscopy was performed but fallopian tubes were normal with no signs of ectopic pregnancy seen. An abdominal ultrasound scan was performed but did not identify the ectopic pregnancy. Owing to worsening symptoms of pain and rising hCG levels, she underwent a further laparoscopy converted to laparotomy and a left salpingo-oophorectomy for suspected left ovarian pregnancy. However, serum hCG levels continued to rise after the surgery, reaching 36 960 IU/mL. An magnetic resonance imaging scan of her abdomen and pelvis was arranged that showed a 4 cm cystic lesion in the segment V of the liver. Further ultrasound correlation showed a hyperechoic lesion with echogenic components suspicious of an ectopic pregnancy with a fetal pole. Fetal heart action was not visualized. A multidisciplinary team approach was adopted with involvement of the hepatobiliary surgical team, and the option of medical management with methotrexate and surgical excision was considered. A decision was made for surgical excision based on the accessible location of the ectopic pregnancy on segment V and the more controlled and predictable outcome with surgical excision. A preoperative computed tomography scan confirmed the lesion in segment V of liver in keeping with liver capsular implantation of ectopic pregnancy (Video still 1). At laparoscopy the ectopic pregnancy was visualized on the inferior surface of liver close to the inferior margin with a band of overlying omental adhesion (Video still 2). The overlying omental adhesions were sealed and cut with advanced bipolar diathermy, keeping a safe margin from the ectopic pregnancy to minimize any bleeding. The liver capsule was then opened with monopolar diathermy, and the small segment of liver with the ectopic pregnancy was excised using a combination of Bowa-Lotus liver blade (Bowa Medical Ltd). Hemostasis was controlled using Floseal hemostatic matrix and applied pressure laparoscopically. Total operating time was 80 minutes with an estimated blood loss of 500 mL. The patient was discharged on day 3 postoperatively, and follow-up serum hCG excluded residual trophoblastic disease. On review of the clinical case, earlier imaging of the upper abdomen when confronted by a persistent pregnancy of unknown location with high levels of serum hCG would have prevented the second laparoscopy, laparotomy, and salpingo-oophorectomy. In similar cases, it would also help exclude poorly differentiated malignancies as a source of serum hCG.

CONCLUSION

Only 27 cases of ectopic pregnancy on the liver have been identified in English literature since 1952, based on a MEDLINE and Embase enquiry and further review of all case reports by the authors to avoid duplicates. Estimated incidence of hepatic implantation is 1 in 15 000 pregnancies; 4 case reports of laparoscopic liver resection have been identified and another case managed by suction from the liver surface [1,2]. The key principle demonstrated is to resect the ectopic pregnancy with a safe margin of liver tissue and any adhesions to avoid catastrophic bleeding from direct handling of the ectopic pregnancy.