Isochromosome 7q is a nonrandom cytogenetic abnormality in Wilms tumor
. Two notable cases are described: (1) a case of bilateral Wilms tumor
in which only the left-sided tumor contained isochromosome 7q and (2)
a case of left-sided Wilms tumor in which the tumor contained isochro
mosome 7q, in addition to four other chromosomal abnormalities associa
ted with Wilms tumor. (C) Elsevier Science Inc., 1998.