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Hepatic resection in children: highlighted and revisited steps

Egyptian Pediatric Association Gazette volume 67, Article number: 3 (2019) Cite this article

Abstract

Background

Hepatectomy in children deserves exhaustive preoperative and intraoperative tools to define the anatomy, minimize blood loss, and confirm adequacy of liver tissue left. The aim of this study is to report our experience in surgical management of liver tumors.

Results

All liver resections performed in Ain-Shams University Hospital, by the same team, between July 2013 and June 2018 were retrospectively reviewed. Data related to basic demographics, indication for resection, methods of parenchymal resection, blood loss, hospital stay, morbidity, and mortality was collected. The study included 27 patients who underwent different types of hepatectomies. There was a male predominance. Age ranged from 6 months to 13 years. Weight ranged from 5.7 to 33.7 kg. Total operative time ranged from 68 to 322 min, while resection time ranged from 34 to 144 min. Blood loss ranged from 53 to 259 ml. Surgical morbidities included five patients with minor biliary leak, three patients had surgical site infection, and one patient had torsion of the remnant liver necessitating repositioning. Recurrence of the mass was faced in three patients with hepatoblastoma. There were two mortalities; one occurred as a sequela of massive intraoperative bleeding and the other took place due to postoperative hepatic insufficiency.

Conclusion

For a safe hepatectomy, thorough familiarity of the hepatic segmental anatomy together with the various techniques for parenchymal resection and vascular control is fundamental. Complications such as biliary leak and torsion of remnant can be easily avoided by simple measures.

Background

Liver tumors are the third most common solid abdominal organ tumor in children representing 0.5–2% of pediatric neoplasm [1]. About half hepatic neoplasms are malignant with hepatoblastoma being the most common followed by hepatocellular carcinoma (HCC) [2]. Hemangioendothelioma, mesenchymal hamartoma, and focal nodular hyperplasia represent the vast majority of benign lesions [3]. Hepatectomies represent one of the most challenging procedures, so it deserves exhaustive preoperative and intraoperative tools to define the anatomy, minimize blood loss, and confirm the adequacy of liver tissue left [4]. These tools include computed tomography (CT) volumetry of the liver, intraoperative ultrasonography, cell saver, and ultrasonic scalpel [5].

The aim of this study is to report our experience in surgical management of liver tumors and highlighting beneficial techniques and gadgets.

Methods

All liver resections performed in Ain-Shams University Hospital, by the same team with more than 10 years’ experience in hepatectomy and liver transplantation, between July 2013 and June 2018 were retrospectively reviewed. Data related to basic demographics, indication for resection, methods of parenchymal resection, blood loss, hospital stay, morbidity, and mortality were collected.

Preoperative investigations included complete blood picture, coagulation profile, liver and kidney function tests, tumor markers, ultrasonography, and CT (Fig. 1) with volumetry. Magnetic resonant cholangiography and CT angiography were reserved for selected cases.

Fig. 1
figure1

CT of right-sided mesenchymal hamartoma

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Operative technique

Hepatectomies started by right subcostal incision with upper midline extension to the xiphoid process along with a left subcostal extension if necessary. The falciform, coronary, and triangular ligaments were divided to mobilize the liver and expose the suprahepatic vena cava. After cholecystectomy, careful hilar dissection was done to expose the portal vein below the triangle of Calot. Intraoperative ultrasonography was performed to delineate the extension of the mass and anatomy of liver vasculature. Courses of hepatic veins were marked on the liver surface by diathermy. Patients were prepared to perform Pringle’s maneuver if needed through passing a tape in the foramen of Winslow and keeping it untied. Selective vascular occlusion of inflow and outflow vessels was done in all cases except those who presented with benign exophytic lesions where non-anatomical resection was the method used (Figs. 2 and 3). Harmonic scalpel was the energy device used for parenchymal resection. Argon beam coagulator was used to achieve hemostasis at the raw liver surface with application of fibrillar™ when needed. We did not use any method to diagnose biliary leak initially; however, based on the high incidence of minor leak in our first 15 cases, we adopted a routine saline test in our subsequent 12 cases which dramatically decreased leakage. A subphrenic drain was left. Starting from the fourth case onwards, the remaining liver was fixed to the anterior abdominal wall to avoid torsion.

Fig. 2
figure2

Exophytic mesenchymal hamartoma, segments II and III

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Fig. 3
figure3

Exophytic mesenchymal hamartoma, segment I

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After surgery, patients were transferred to the intensive care unit until stabilization of the general condition. Liver function tests were checked every other day. Feeding was initiated once bowels were open. Drain was removed once output became clear serous fluid and dropped below 50 ml per day. Ultrasound and Doppler ultrasound were done before discharge to exclude any intraabdominal collection or biliary radical dilatation and to check adequacy of blood flow to the remaining liver respectively.

Results

This study included 27 patients who underwent different types of hepatectomies (Table 1). There was male predominance (16 males and 11 females). Age ranged from 6 months to 13 years (mean 3.88 years). Weight ranged from 5.7 to 33.7 kg (mean 15 kg). A segment or more of the right lobe was affected in 15 cases. Indications for hepatectomies included hepatoblastoma in 10 cases (Fig. 4), 9 cases of mesenchymal hamartoma, HCC in 3 (Fig. 5), focal nodular hyperplasia in 3, and hemangioendothelioma in 2. Hepatitis C was positive in all cases presenting with HCC. Type of hepatectomies performed included right hepatectomy in 12 patients, extended right hepatectomy in 2, right posterior segmentectomy in 1, left lateral segmentectomy in 6, left hepatectomy in 3, and non-anatomical resections in 3 cases. Selective vascular occlusion was the vascular clamping technique used in all cases, which underwent anatomical resections. Non-anatomical resections were done in cases of exophytic mesenchymal hamartomas not warranting formal resections.

Table 1 Patient’s demographic data, diagnosis, segments affected, type of resection, time, blood loss, and complications
Full size table
Fig. 4
figure4

Right-sided hepatoblastoma

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Fig. 5
figure5

Right-sided HCC

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Total operative time ranged from 68 to 322 min (mean ± standard deviation 173.7 ± 65 min), while resection time ranged from 34 to 144 min (mean ± standard deviation 88.8 ± 35.3 min). Operative time was shorter in benign conditions and was directly related to the size of the mass. The mean resection time for malignant and benign lesions was 91.6 min and 86.1 min respectively. Blood loss ranged from 53 to 259 ml (mean ± standard deviation 119.3 ± 51 ml). Only 5 patients required intraoperative blood transfusion. Resection of malignant lesions was associated with more blood loss. The mean blood loss for malignant lesions was 135.7 ml and for benign lesions was 104 ml.

Surgical morbidities included five patients (18.5%) with minor biliary leaks. They were managed conservatively with drainage and were followed up through clinical examination, laboratory data, and ultrasonographic scans to rule out the presence of intraperitoneal collection or biliary dilatation. Those patients were sent home once tolerating full oral feeds. Their drains were removed when output declined into nil, unlike other patients who had their drains removed when output became clear serous fluid and dropped below 50 ml per day. Three patients (11.1%) had a surgical site infection (SSI). They were managed by antibiotics and local wound control. One patient had torsion of the remnant liver necessitating repositioning. This case was manifested by deterioration in the level of consciousness. Liver enzymes were rising. Urgent Doppler ultrasound showed complete hepatic venous outflow obstruction with severe congestion of the remnant liver.

The follow-up period ranged from 6 to 54 months (median 25 months). Recurrence was encountered in three patients with hepatoblastoma 4, 6, and 12 months post-operatively. One had liver transplantation, while the other two had another successful resection.

We had two post-operative deaths. One of them occurred 2 h postoperative as a sequala of massive intraoperative bleeding from tumor rupture, while the other resulted from post-hepatectomy liver failure despite adequate remnant liver tissue as was shown by preoperative CT volumetry.

Discussion

The most life-threatening complication during liver resections is hemorrhage whether intraoperative or post-operative [4]. Unlike adults, children have small blood volumes and can suffer greatly from blood loss as small as 100 ml. Furthermore, children have near-normal liver tissue leading to more hemorrhage when compared to cirrhotic adult liver [6]. Meticulous surgical techniques are crucial to minimize blood loss, particularly avoiding injury to the small tributaries draining into the inferior vena cava which should be ligated in continuity then cut, instead of cauterized, because they will bleed extensively if severed [4]. Wang and his colleagues suggested that maintaining a low central venous pressure (2–4 mmHg) can reduce blood loss [7]. In our cases, we were keen to maintain central venous pressure below 5 cmH2O to decrease bleeding and blood transfusion. If injury to one of the hepatic veins has occurred, the anesthesiologist deliberately increased the peak end expiratory pressure to guard against air embolism. The Society of Pediatric Oncology Liver Tumor Study Group launched its first prospective trial (SIOPEL-1) in 2002. Among the 100 patients who underwent hepatectomy, hemorrhage was less than 500 ml in 60% of cases, while it was more than 1000 ml in 13% of them [8]. In comparison, intraoperative blood loss was less than 500 ml in all our cases. In a study published in 2017 [9], Busweiler and his colleagues reported blood transfusion in 45% of 73 patients underwent partial hepatectomy. In our series, 18.5% of our patients received blood transfusion.

Many vascular clamping techniques are available in the surgeon’s hands. Pringle’s maneuver being the simplest and highly effective. However, ischemia of remaining liver and intestinal congestion always occur. Total vascular exclusion ensures a bloodless operation, but still has its drawbacks on hemodynamic stability. Makuuchi and his coworkers described selective vascular exclusion in 1987 obviating disadvantages of both Pringle’s maneuver and total vascular exclusion [10]. Selective vascular occlusion together with high dissection of the porta hepatis and ligation of up to second-order branches of portal and arterial vessels were used in our series. This technique has been proved to be both effective and safe by many other authors [11]. It decreases visceral congestion as part of the portal flow is preserved, furthermore only the excised portion of the liver is subjected to anoxia [12].

Many methods are available for parenchymal resection such as finger fracture, clamp crushing, and different energy devices [13,14,15]. Among the variety of parenchymal resection methods enumerated, we opted for the use of harmonic scalpel. Harmonic scalpel causes protein denaturation and coagulation by high-frequency ultrasound vibration. Despite decreasing resection time and bleeding when compared to finger fracture, it was associated with a higher incidence of the biliary leak [16]. We did have 5 cases (18.5%) with postoperative minor biliary leak in our series; however, all were treated conservatively.

Intraoperative ultrasonography was introduced in the 1980s [17]. Since then, intraoperative ultrasonography has been a very useful tool to define the extent of the mass and its relation to the important vascular structures. It can detect new tumors not diagnosed preoperatively or reveal new information about the lesion [18]. Several reports suggested a rate of 20% alteration in surgical plan due to information gained from intraoperative ultrasonography [19]. In our series, it changed our initial plan from right posterior hepatectomy to right hepatectomy in 2 cases (7.4%) due to the detected change in tumor extent. Also, delineation of the main hepatic veins was of great help to decrease blood loss.

Biliary leak is not an uncommon complication after hepatectomies. Most are minor leaks from the resection margin, which resolve with expectant management. However, rare leaks from disconnected ducts or excluded segment duct may carry a grave prognosis [20]. Such major leaks are commonly caused by aberrant anatomy of biliary tree. Trans-cystic cholangiography using radio-opaque dye, methylene blue, indigo-carmine, fat emulsion, or normal saline is recommended by many authors to diagnose and suture any leak [21, 22]. We did not use any bile leakage test initially in the first 15 cases. We had a minor biliary leak in 4 cases (26.7%). Therefore, we started to use saline test routinely. As a result, we had only 1 case of minor bile leak in our subsequent 12 cases. Yamashita and his coauthors reported incidence of 4.5% bile leak without leak test and 0% after they started testing with saline [23]. They concluded that saline test is safe and effective in reducing bile leak rates to 0%.

A case with HCC and hepatitis C virus died due to hepatic insufficiency after extended right hepatectomy, although CT volumetry of this patient confirmed adequacy of remnant liver tissue. Inaccuracy in CT volumetry results may be attributed to the difference between radiological plane and actual surgical plane. Radtke and associates reported overestimation of volume in 61% of cases and underestimation in 15% due to extreme difficulty to follow Cantlie’s line especially in two-dimensional images [24]. Furthermore, CT volumetry does not assess for the function in the remnant liver tissue; therefore, it is only accurate in patient with healthy parenchyma. Dinant and others reported 13% liver cell failure despite adequate remnant liver tissue calculated by volumetry. They concluded that hepatobiliary scintigraphy is more accurate in assessing adequacy of future remnant [25]. Also, the use of a fixed conversion factor when converting volume to weight is doubtful since there may be individual variation [26].

Although hepatic venous outflow obstruction due to torsion is a well-known life-threatening complication after liver transplantation, it has been reported sporadically in the literature in the remaining left lobe after right hepatectomy [27]. To the best of our knowledge, our case is the first to be reported in an infant. This case was early in our series. After which, we have started to routinely fix the remnant liver to the falciform ligament.

Despite advances in surgical techniques, liver resection remains a complex and high-risk procedure. There is limited data in the literature regarding perioperative and short-term outcome in pediatric population. The first prospective trial of The Society of Pediatric Oncology Liver Tumor Study Group (SIOPEL-1) reported 18% surgical morbidity and 5% surgical mortality [8]. In an attempt to define the short-term outcome in children, Zwintscher and his coauthors reviewed the database of 126 children who underwent liver resection in 2009 due to primary hepatic malignancy. They reported 30.7% morbidity and 3.7% mortality [28]. In 2016, a chart review was carried out to assess postoperative complications in children underwent partial hepatectomy for hepatoblastoma in the Netherlands between 1990 and 2013 [9]. Complications were found in 58% of 73 patients but there was no early mortality (within 30 days). In our series, there was an overall morbidity rate of 44.4%, while the mortality rate was 7.4%.

We had an 11.1% infection rate in the form of SSI, but there was no wound dehiscence or reoperation. Vascular complications occurred in 3.6% of our cases in the form of hepatic venous outflow obstruction in one case. In comparison, Busweiler and his colleagues reported 8% infection rate with reoperation on two occasions. Also, they reported vascular complications in 3% of their cases in the form of Budd Chiari Syndrome in one patient and thrombosis of the portal and left hepatic veins in another case [9].

In adults, minimally invasive liver resection (MILR) is well established for resection of both benign and malignant tumors with comparable outcome to open resection [29, 30]. Different techniques used included pure laparoscopy, hand-assisted laparoscopy, and the hybrid technique [31]. In children, literature and evidence are lacking to support MILR as most published articles are case reports and small case series [31, 32], which can be explained by the rarity of cases and the limited peritoneal domain in children that hinders MILR. To the best of our knowledge, there is only one large retrospective study in the English literature published in 2016, which lacks comparison versus open technique [33]. We believe MILR in pediatric population requires specialized training to develop appropriate expertise, highly equipped theaters, and proper patient selection.

Limitations of our study included being a retrospective one, besides the absence of a control group.

Conclusion

For a safe hepatectomy to be carried out, thorough familiarity of the hepatic segmental anatomy together with the various techniques for parenchymal resection and vascular control are fundamental. Injection of saline to determine any biliary leak and fixation of the remnant liver to the anterior abdominal wall are simple steps, yet lower complication rate. Results of CT volumetry should be considered within the context of the global liver function.

Availability of data and materials

All data generated or analyzed during this study are included in this published article.

Abbreviations

CT:

Computed tomography

HCC:

Hepatocellular carcinoma

MILR:

Minimally invasive liver resection

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Affiliations

  1. Pediatric Surgery Department, Ain-Shams University, Abbaseya, Cairo, Egypt

    Hesham Mohammed Abdelkader, Mohamed Abdelsattar & Ahmed Abdelhaseeb Youssef

  2. Pediatric Surgery Department, Helwan University, Cairo, Egypt

    Mohamed Abdel-Latif

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  1. Hesham Mohammed Abdelkader
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  2. Mohamed Abdel-Latif
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Contributions

HA, MA, MA, and AY contributed equally in the design of the work, collection and analysis of data, drafting and revising of the manuscript, and approving the final version for publishing.

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Correspondence to Ahmed Abdelhaseeb Youssef.

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Ethical committee of the Surgery Department, Faculty of Medicine, Ain-Shams University approval was obtained in September 2018. Consent to participate is not applicable as our study is retrospective and descriptive not experimental.

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Abdelkader, H.M., Abdel-Latif, M., Abdelsattar, M. et al. Hepatic resection in children: highlighted and revisited steps. Egypt Pediatric Association Gaz 67, 3 (2019). https://doi.org/10.1186/s43054-019-0008-4

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Keywords

  • Liver resection
  • Hepatectomy
  • Liver neoplasm
  • Liver tumors