The cells of the adult-type hepatocellular carcinoma are epithelial while hepatoblastoma has a less differentiated embryonal appearance. Hepatocellular carcinoma also differs from hepatoblastoma in that it often arises in a previously abnormal, cirrhotic liver. Both histologic types more commonly arise in the right lobe of the liver.
A distinctive histologic variant of hepatocellular carcinoma, termed fibrolamellar carcinoma, has been described in the livers of older children and young adults. Fibrolamellar carcinoma has been associated with an improved prognosis and is not associated with cirrhosis.[11,12,13] The improved outcome in older series may be related to a higher proportion of tumors being less invasive and more resectable in the absence of cirrhosis, as the outcome in recent prospective studies, when compared stage for stage, is not different from other hepatocellular carcinomas.[14,15] Fibrolamellar hepatocellular carcinoma has also been reported in infants.
Undifferentiated Embryonal Sarcoma of the Liver
Undifferentiated embryonal sarcoma of the liver is a distinct clinical and pathologic entity and accounts for 2% to 15% of pediatric hepatic malignancies. Distinctive features are intracellular hyaline globules and marked anaplasia on a mesenchymal background.
Infantile Choriocarcinoma of the Liver
These tumors are usually very friable and hemorrhagic and may present with bleeding into the tumor. Cytotrophoblasts and syncytiotrophoblasts are both present. The former are closely packed nests of medium-sized cells with clear cytoplasm, distinct cell margins, and vesicular nuclei. The latter are very large multinucleated syncytia formed from the cytotrophoblasts.
- Ortega JA, Douglass EC, Feusner JH, et al.: Randomized comparison of cisplatin/vincristine/fluorouracil and cisplatin/continuous infusion doxorubicin for treatment of pediatric hepatoblastoma: A report from the Children's Cancer Group and the Pediatric Oncology Group. J Clin Oncol 18 (14): 2665-75, 2000.
- Weinberg AG, Finegold MJ: Primary hepatic tumors of childhood. Hum Pathol 14 (6): 512-37, 1983.
- Haas JE, Muczynski KA, Krailo M, et al.: Histopathology and prognosis in childhood hepatoblastoma and hepatocarcinoma. Cancer 64 (5): 1082-95, 1989.
- Trobaugh-Lotrario AD, Tomlinson GE, Finegold MJ, et al.: Small cell undifferentiated variant of hepatoblastoma: adverse clinical and molecular features similar to rhabdoid tumors. Pediatr Blood Cancer 52 (3): 328-34, 2009.
- Meyers RL, Rowland JR, Krailo M, et al.: Predictive power of pretreatment prognostic factors in children with hepatoblastoma: a report from the Children's Oncology Group. Pediatr Blood Cancer 53 (6): 1016-22, 2009.
- De Ioris M, Brugieres L, Zimmermann A, et al.: Hepatoblastoma with a low serum alpha-fetoprotein level at diagnosis: the SIOPEL group experience. Eur J Cancer 44 (4): 545-50, 2008.
- Rowland JM: Hepatoblastoma: assessment of criteria for histologic classification. Med Pediatr Oncol 39 (5): 478-83, 2002.
- Gunawan B, Schäfer KL, Sattler B, et al.: Undifferentiated small cell hepatoblastoma with a chromosomal translocation t(22;22)(q11;q13). Histopathology 40 (5): 485-7, 2002.
- Conran RM, Hitchcock CL, Waclawiw MA, et al.: Hepatoblastoma: the prognostic significance of histologic type. Pediatr Pathol 12 (2): 167-83, 1992 Mar-Apr.
- Haas JE, Feusner JH, Finegold MJ: Small cell undifferentiated histology in hepatoblastoma may be unfavorable. Cancer 92 (12): 3130-4, 2001.
- Lack EE, Neave C, Vawter GF: Hepatocellular carcinoma. Review of 32 cases in childhood and adolescence. Cancer 52 (8): 1510-5, 1983.
- Craig JR, Peters RL, Edmondson HA, et al.: Fibrolamellar carcinoma of the liver: a tumor of adolescents and young adults with distinctive clinico-pathologic features. Cancer 46 (2): 372-9, 1980.
- Farhi DC, Shikes RH, Murari PJ, et al.: Hepatocellular carcinoma in young people. Cancer 52 (8): 1516-25, 1983.
- Czauderna P, Mackinlay G, Perilongo G, et al.: Hepatocellular carcinoma in children: results of the first prospective study of the International Society of Pediatric Oncology group. J Clin Oncol 20 (12): 2798-804, 2002.
- Katzenstein HM, Krailo MD, Malogolowkin MH, et al.: Fibrolamellar hepatocellular carcinoma in children and adolescents. Cancer 97 (8): 2006-12, 2003.
- Cruz O, Laguna A, Vancells M, et al.: Fibrolamellar hepatocellular carcinoma in an infant and literature review. J Pediatr Hematol Oncol 30 (12): 968-71, 2008.
- Nicol K, Savell V, Moore J, et al.: Distinguishing undifferentiated embryonal sarcoma of the liver from biliary tract rhabdomyosarcoma: a Children's Oncology Group study. Pediatr Dev Pathol 10 (2): 89-97, 2007 Mar-Apr.
- Stocker JT: Hepatic tumors in children. Clin Liver Dis 5 (1): 259-81, viii-ix, 2001.
- Cushing B, Perlman EJ, Marina NM, et al.: Germ cell tumors. In: Pizzo P, Poplack D: Principles and Practice of Pediatric Oncology. 5th ed. Philadelphia, Pa: Lippincott Williams and Wilkins, 2005, pp 1116-38.