Sinonasal small cell neoplasm developing after radiation therapy for retinoblastoma: An immunohistologic, ultrastructural, and cytogenetic study

Daisy Saw, John K.C. Chan, Jaishree Jagirdar, M. Alba Greco, Michael Lee

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8 Scopus citations


Patients with retinoblastoma have an increased risk of developing second primary tumors. Only a few examples of sinonasal small cell neoplasms developing after radiation therapy for retinoblastoma have been reported. We report one such case that developed 18 years after treatment for retinoblastoma. Histologic examination revealed a small, blue, round cell tumor without rosettes or cytoplasmic glycogen. Immunohistochemically, the tumor cells were positive for neuron-specific enolase, synaptophysin, and S-100 protein, but negative for epithelial and mesenchymal markers, suggesting that this was a primitive neuroectodermal tumor. Cytogenetic studies of this tumor failed to reveal the chromosome 13 abnormality typical of retinoblastoma and the t(11:22) translocation typical of the group of peripheral neuroepitheliomas.

Original languageEnglish (US)
Pages (from-to)896-899
Number of pages4
JournalHuman Pathology
Issue number8
StatePublished - Aug 1992



  • immunohistochemistry
  • radiation
  • retinoblastoma
  • sinonasal neoplasm

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

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