title: Sinonasal small cell neoplasm developing after radiation therapy for retinoblastoma: an immunohistologic, ultrastructural, and cytogenetic study.
abstract: 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.
authors.affiliation: Department of Surgical Pathology, New York University Medical Center, New York.
authors.forename: D
authors.initials: D
authors.lastname: Saw
authors.forename: J K
authors.initials: JK
authors.lastname: Chan
authors.forename: J
authors.initials: J
authors.lastname: Jagirdar
authors.forename: M A
authors.initials: MA
authors.lastname: Greco
authors.forename: M
authors.initials: M
authors.lastname: Lee
mesh_terms: D000328:Adult; D018288:Carcinoma, Small Cell / Q000209:etiology* / Q000235:genetics / Q000648:ultrastructure; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D003593:Cytoplasm / Q000737:chemistry; D004273:DNA, Neoplasm / Q000032:analysis / Q000235:genetics; D005134:Eye Neoplasms / Q000532:radiotherapy*; D005260:Female; D006003:Glycogen / Q000032:analysis; D006801:Humans; D007150:Immunohistochemistry; D008854:Microscopy, Electron; D009381:Neoplasms, Radiation-Induced / Q000737:chemistry / Q000235:genetics / Q000648:ultrastructure; D016609:Neoplasms, Second Primary / Q000473:pathology*; D010255:Paranasal Sinus Neoplasms / Q000209:etiology* / Q000235:genetics / Q000648:ultrastructure; D012175:Retinoblastoma / Q000532:radiotherapy*; D009418:S100 Proteins / Q000032:analysis; D014178:Translocation, Genetic
chemical_list: D004273:DNA, Neoplasm; D009418:S100 Proteins; D006003:Glycogen