A renal tumour which has a multicentric origin -
Wilms tumor 

Wilms tumor is the most common primary renal tumor of childhood.
The usual age for diagnosis is 2-5 years.
Approximately 5% to 10% of Wilms tumors involve both kidney, either simultaneously or one after the other.
Nephrogenic rests are the precursor lesions of Wilms Tumor.
Most children with Wilms tumors present with a large abdominal mass.
Less common presentations are hematuria, abdominal pain, intestinal obstruction, and hypertension.
"10% of Wilms tumors are either bilateral or multicentric at the time of diagnosis". - Robbin's
Wilm's tumour
Transitional cell carcinoma
Squamous cell carcinoma
Renal cell