Final answer:
An associated abnormality with a Wilms' tumor is Beckwith-Wiedemann syndrome, which can include umbilical defects, macroglossia, and gigantism, as well as an increased risk for other conditions such as horseshoe kidney.
Step-by-step explanation:
An associated abnormality with a Wilms' tumor is Beckwith-Wiedemann syndrome, which includes symptoms such as umbilical defects, macroglossia, and gigantism.
Wilms' tumor is a type of kidney cancer that primarily affects children.
The existence of certain other abnormalities, such as neurofibromatosis and horseshoe kidney, might suggest an underlying genetic disorder disease which could be associated with the development of tumors like Wilms' tumor.