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International Pediatric Liver Tumors Consensus Classification of Hepatoblastoma

International Pediatric Liver Tumors Consensus Classification of Hepatoblastoma
Epithelial
Fetal
  • Fetal with low mitotic activity (well differentiated)
  • Fetal, mitotically active (crowded fetal)
  • Pleomorphic
Embryonal
Small cell undifferentiated
  • SMARCB1 (INI1)-negative
  • SMARCB1 (INI1)-positive
Cholangioblastic
Macrotrabecular
Mixed epithelial (any/all above)
Mixed epithelial and mesenchymal
Without teratoid features
With teratoid features
SMARCB1: SWI/SNF-related, matrix-associated, actin-dependent regulator of chromatin, subfamily B, member 1; INI1: integrase interactor-1.
Adapted by permission from Macmillan Publishers Ltd: Modern Pathology. López-Terrada D, Alaggio R, de Dávila MT, et al. Towards an international pediatric liver tumor consensus classification: proceedings of the Los Angeles COG liver tumors symposium. Mod Pathol 2014; 27:472. https://www.nature.com/modpathol/.
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