Surgical treatment of hepatic tumors in children: lessons learned from liver transplantation.
OBJECTIVE
Hepatectomy remains a complex operation even in experienced hands. The objective of the present study was to describe our experience in liver resections, in the light of liver transplantation, emphasizing the indications for surgery, surgical techniques, complications, and results.


METHODS
The medical records of 53 children who underwent liver resection for primary or metastatic hepatic tumors were reviewed. Ultrasonography, computed tomographic (CT) scan, and needle biopsy were the initial methods used to diagnose malignant tumors. After neoadjuvant chemotherapy, tumor resectability was evaluated by another CT scan. Surgery was performed by surgeons competent in liver transplantation. As in liver living donor operation, vascular anomalies were investigated. The main arterial anomalies found were the right hepatic artery emerging from the superior mesenteric artery and left hepatic artery from left gastric artery. Hilar structures were dissected very close to liver parenchyma. The hepatic artery and portal vein were dissected and ligated near their entrance to the liver parenchyma to avoid damaging the hilar vessels of the other lobe. During dissection of the suprahepatic veins, the venous infusion was decreased to reduce central venous pressure and potential bleeding from hepatic veins and the vena cava.


RESULTS
Fifty-three children with hepatic tumors underwent surgical treatment, 47 patients underwent liver resections, and in 6 cases, liver transplantation was performed because the tumor was considered unresectable. There were 31 cases of hepatoblastoma, with a 9.6% mortality rate. Ten children presented with other malignant tumors-3 undifferentiated sarcomas, 2 hepatocellular carcinomas, 2 fibrolamellar hepatocellular carcinomas, a rhabdomyosarcoma, an immature ovarian teratoma, and a single neuroblastoma. These cases had a 50% mortality rate. Six children had benign tumors-4 mesenchymal hamartoma, 1 focal nodular hyperplasia, and a mucinous cystadenoma. All of these children had a favorable outcome. Hepatic resections included 22 right lobectomies, 9 right trisegmentectomies, 8 left lobectomies, 5 left trisegmentectomies, 2 left segmentectomies, and 1 case of monosegment (segment IV) resection. The overall mortality rate was 14.9%, and all deaths were related to recurrence of malignant disease. The mortality rate of hepatoblastoma patients was less than other malignant tumors (P = .04).


CONCLUSIONS
The resection of hepatic tumors in children requires expertise in pediatric surgical practice, and many lessons learned from liver transplantation can be applied to hepatectomies. The present series showed no mortality directly related to the surgery and a low complication rate.
Tannuri
Ana Cristina Aoun
AC
Pediatric Surgery Division, Pediatric Liver Transplantation Unit and Laboratory of Research in Pediatric Surgery, University of Sao Paulo Medical School, CEP 01246-903 Sao Paulo, Brazil.
Tannuri
Uenis
U
Gibelli
Nelson Elias Mendes
NE
Romão
Rodrigo Luiz Pinto
RL
D000367:Age Factors; D016063:Blood Loss, Surgical; D006528:Carcinoma, Hepatocellular / Q000401:mortality / Q000601:surgery; D005500:Follow-Up Studies; D006498:Hepatectomy / Q000379:methods; D018197:Hepatoblastoma / Q000401:mortality / Q000601:surgery; D006801:Humans; D007223:Infant; D008113:Liver Neoplasms / Q000401:mortality / Q000601:surgery*; D016031:Liver Transplantation / Q000379:methods*; D009364:Neoplasm Recurrence, Local / Q000401:mortality / Q000601:surgery; D011183:Postoperative Complications / Q000209:etiology; D015996:Survival Rate; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome