This case report describes a 75 year old man who had a renal papillary carc
inoma associated with a low grade tumour of the collecting ducts. These tum
ours showed different immunohistochemical patterns for epithelial membrane
antigen, cytokeratin 19, and Ulex europaeus lectin expression. In addition,
cytogenetic findings were 47, XY, +7 <7> and 45, XY, -8, add(12)(q-ter)<10
> for the papillary renal carcinoma and the low grade tumour of the collect
ing ducts, respectively. This is the first report where these two types of
tumour are associated and cytogenetically distinguished.