Histopathological and genetic characteristics of the tumors.

uNB, undifferentiated neuroblastoma; pdNB, poorly differentiated NB; nGNB, nodular ganglioneuroblastoma; %, percentage; het, heterogeneous; ND, not done; D, diploid; BD, borderline diploid, T, triploid; TE, tetraploid; P, pentaploid. All cases presented dmin except case number 5 (* dmin plus HSR). The patients have been listed according to the stage of disease. ID was assigned according to genetic aberrations of chromosome 2.