Fine needle aspiration cytology of undifferentiated small cell ("anaplastic") hepatoblastoma. A case report.

Cytologic features of a rare case of small cell undifferentiated ("anaplastic") hepatoblastoma are presented. The tumor cells were primitive and closely resembled the group of "small blue cell" pediatric neoplasms--neuroblastoma, lymphoma, Ewing's sarcoma and rhabdomyosarcoma. This particular subtype of hepatoblastoma is the least common and is associated with the worst prognosis.