Abdominal Pregnancy: Epidemiological, Diagnostic, Therapeutic and Prognostic Aspects: A Case Report from the Yaounde Central Hospital (Cameroon)

Abdominal pregnancy (AP) is a relatively rare and potentially serious form of ectopic pregnancies (EPs). We report the case of a haemorrhagic abdominal pregnancy at 15 weeks of amenorrhea complicated by hypovolaemic shock, with a favorable outcome. Our aim is to outline the epidemiological, clinical, therapeutic and prognostic features of this condition.


Introduction
Abdominal pregnancy (AP) is defined as the implantation and development of the fertilized egg in the peritoneal cavity. The actual incidence of this medical and surgical entity is not well defined according to different authors, and it is more marked in Africa than in developing countries. However, it remains a rather rare and serious condition requiring multidisciplinary management.
We report the case of a haemorrhagic abdominal pregnancy at 15 weeks of amenorrhea complicated by hypovolaemic shock, with a favourable outcome.
The aim here is to recall the epidemiological particularities and to expose the clinical, therapeutic and prognostic aspects of this condition.

Patient and Observation
We report the case of an abdominal pregnancy in a 36-year-old single female hairdresser, delivered at 14 weeks of amenorrhea (WA) and 03 days (D) of the theoretical term. She has a history of 03 normal deliveries at term by vaginal route for a total of 4 gestures. She has a regular menstrual cycle of 31 days. She had her first sexual intercourse at the age of 17. She has had 5 cumulative sexual partners and currently has 01. She does not use contraceptive methods and has unprotected sex. She had never been screened for sexually transmitted infections.
She was referred to us from a local district medical center for better management of an abdominal pregnancy (GA). Two weeks earlier, the patient presented with postprandial nausea and vomiting, without fever, accompanied by a small amount of blackish per vaginal bleeding. A few days later she experienced mild abdominal pain of progressive onset, an increase in abdominal volume, the perception of fetal movements, moderate asthenia and dizziness. Thus motivating a consultation in the said medical center where an abdominopelvic ultrasound was performed, showing an evolving abdominal pregnancy of 15 WA + 04 D, located at the limit of the right flank (RF) and the right iliac fossa (RIF) and a large amount of haemoperitoneum. Faced with these findings and with a limited technical platform, the medical center immediately referred the patient to us.
When we saw the patient, she was complaining of asthenia and generalized abdominal pain. She did not have any breakthrough bleeding. Her blood pressure was 100/70 mmHg, her pulse rate was 104 beats per minute, her temperature was 37.4 degrees Celsius, and her respiratory rate was 24 cycles per minute. The conjunctiva was pale. The abdomen was undistended, mobile with respiration. We noted marked abdominal tenderness to palpation on RIF and RF with a mass of approximately 16 cm long axis, umbilical rebound tenderness, and a sloping dullness. The fetal heart sounds (FHS) were perceptible and tachycardic at 172 bpm. On gynaecological examination, we observed on speculum, a macroscopically normal purplish cervix, no bleeding was observed. On digital vaginal examination, the cervix was posterior, long, closed, mobilisation of the cervix was not painful, the uterus was of the normal size, the adnexa was slightly tender without palpable masses. In addition, the posterior fornix was slightly bulging and sensitive. An emergency blood count showed a haemoglobin level of 4.9 g/dl and platelets of 270,000/µl. We concluded that the pregnancy was a haemorrhagic abdominal pregnancy complicated by severe anaemia at an ultrasound term of 15 WA + 04 D.
The initial management consisted of counselling, conditioning of the patient with 2 large-bore venous lines and reservation of 2 blood bags, emergency laparotomy under general anaesthesia with oeso-thracheal intubation. The preoperative check-up was normal. We concomitantly prepared for an intraoperative auto-transfusion.
Findings at emergency laparotomy were: Hemoperitoneum of about 2000 ml; Abdominal pregnancy in the RF with live fetus and placenta adhered largely to the omentum and partially to the colon, right fringe and contralateral ovary ( Figure 1), we noted active bleeding from the placenta, the contralateral tube was macroscopically normal, fetus + placenta block weighed 220 g. The uterus was of normal size and the pelvis was adherent with Fitz-Hug-Curtis syndrome.
The intraoperative procedures consisted of: Aspiration of 600 ml of haemoperitoneum for autotransfusion ( Figure 2) and the rest of the haemoperitoneum; careful digital adhesiolysis of the placenta on the left omentum, colon and ovary, clamping and a partial right salpingectomy ( Figure 3 and Figure 4). Finally, we placed a parietal drain.    The postoperative follow-up was marked by stabilisation of vital parameters on Day 1, and a transfusion of 2 blood bags on Day 2. Due to a lack of funds, the patient was not able to undergo the pre-therapeutic check-up until after 7 days.
The parietal drain was removed at D8 and she received a dose of methotrexate 1 mg/kg/dose at D9. The patient was discharged on the tenth postoperative day.

Discussion
AP accounts for 1% of all EPs. In developed countries, its incidence is 1 per 10,000 live births [1] [2]. Compared to developing countries, particularly in Africa, it is less rare and its frequency varies from 0.009% in Morocco to 0.152% in Nigeria (Table 1) [3]- [9]. No statistical data from Cameroon was found in the literature.
A distinction is made between primary AP with primary implantation of the egg in the abdominal cavity and secondary AP where trophoblastic implantation occurs by grafting into the abdominal cavity after a tubal abortion [10]. Studdiford described 3 criteria for primary AP: Normal adnexa, with no evidence of recent injury; Absence of uteroperitoneal fistula; strictly peritoneal location of a pregnancy less than 12 weeks old. It may be pelvic (Posterior fornix, fundus or posterior aspect of the uterus) as well as abdominal (diaphragm, liver, spleen, omentum), or even retroperitoneal [11]; the clinical presentation of AP is similar to that of first trimester EP [12]. Secondary AP, which is usually diagnosed later in pregnancy, appears to be more common. In practice, this classification is controversial as it is often difficult to establish and of little clinical interest. Classification according to the term is preferred. A distinction is made between early and advanced AP diagnosed after 20 days' gestation [13]. Our patient probably had early secondary AP.  AP after hysterectomy has also been described: 29 cases reported in the literature in 1984 [18]. None of these risk factors was found in our patient. However, she is now at risk of another AP.
The preoperative diagnosis of AP is difficult, the non-specific nature of the symptoms, the clinical polymorphism linked to the diagnostic term, the low profitability of traditional imaging and its scarcity explain why, in 50% of cases, its discovery will be fortuitous during the operation. On the maternal side, there is often an episode of paroxysmal abdominopelvic pain at the beginning of forgotten that in the majority of countries in the world MRI is not accessible: ultrasound is, therefore, the decisive imaging examination [3] [19]. The diagnosis of AP is, therefore, difficult and requires "thinking ectopic" as recommended by Moonen [20].
Regarding the therapeutic aspect, most authors recommend laparotomy once the diagnosis has been made, regardless of the fetal status, given the unpredictable and serious nature of maternal complications occurring at any term [1] [21] [22]. The rate of delivery in the case of AP is estimated after reviewing the literature at 60% [25]. Pre-operative assessment of the placental site is based on MRI, which provides the best indication of the insertion site. MRI can also provide other information (vascular relationships, visualisation of infarction) [29]. In his series of three cases, Shumway noted that an elevated alpha-fetoprotein level is suggestive of an extensive placental insertion site at high risk of bleeding [30]. In our case we did not have an MRI scan and also did not perform an alpha-fetoprotein assay.
There are three possibilities: 1) Delivering the placenta during laparotomy when this is feasible; 2) Leaving the placenta in situ after proximal cord ligation and waiting for spontaneous resorption monitored by echo-Doppler [31] [32] and b-HCG; 3) Or leaving the placenta in situ and adding methotrexate treatment.
The place of embolisation remains to be clarified: Kerr noted in a series of three cases the interest of preoperative embolisation allowing in each case a delivery at the cost of a modest haemorrhage without subsequent complications [33]. Martin published a case of embolisation performed on day 1 of laparotomy with placenta left in situ complicated by secondary haemorrhage [34].

A. Kamga Talom et al. Open Journal of Obstetrics and Gynecology
Placental resorption is slow [35], secondary complications have been described, but are uncommon (secondary haemorrhage, sub-occlusive syndrome, sepsis, ureteral obstruction [36], choriocarcinoma). Hreshchyshyn reported in a series of 101 cases with 71% delivery at laparotomy a significantly reduced rate of surgical revision and re-hospitalisation [37]. We insist on a precise anaesthetic and resuscitation protocol that is particularly useful in the case of emergency laparotomy. Our patient's postoperative course up to 9 days post-op was simple.
Regarding the prognosis, AP is responsible for perinatal mortality of between 40 and 95% [1]. Maternal mortality is 5.2‰ [38]. Its early diagnosis considerably reduces the maternal risk [1].

Conclusion
Abdominal pregnancy is an extremely rare condition in developed countries.
However, it still remains a reality in our regions. It poses a real diagnostic and therapeutic problem. Depending on the term and the clinical presentation, the therapeutic approach can be conservative or interventional. This high-risk maternal and fetal pregnancy must be approached on a case-by-case basis by a multidisciplinary team.