Bellini's duct tumor associated with end stage renal disease: a case diagnosed by lectin immunohistochemistry

We report a hemodialysis patient with an atypical renal neoplasm. The tumor cells were arranged in a two-cell pattern similar to that in the usual excretory duct systems. The histochemical staining pattern with some lectins and monoclonal antibody corresponded to the distal nephrons of normal kidney tissue. These findings enabled us to diagnose this patient as having so-called Bellini's duct tumor.