We report the results of cytogenetic analysis in two children with neuroblastoma. The analysis was performed on slides obtained from a 24-hour bone marrow (BM) culture or by a direct method of the primary tumor tissue. The structural and numeric karyotype aberrations were established, including structural aberrations of chromosome 1. The finding of i(1q) and t(1;5)(p22;q13) is of interest because these chromosome aberrations are rare in this type of disease.