Collecting duct carcinoma mixed with common renal cell carcinoma: Analysisof morphological characteristics using lectin histochemistry

Recently, cases of collecting duct carcinoma have been reported which were thought to have arisen fr om the renal collecting ducts ol distal tubuli. W e present here a rare case of collecting duct carcinoma mixed with common ( conventional) renal cell carcinoma. A 51-year-old man underwent right nephr ectony under the diagnosis of renal tumor. Histochemically, markers for the collecting ducts / distal tubuli, such as peanut agglutinin (PNA) and soyb ean agglutinin (SBA), were identified in the collecting duct carcinoma as w ell as on several luminar surfaces of the common renal cell carcinoma. Base d on the results of histological, histochemical and chromosomal examination s, we speculated on the histogenesis of this collecting duct carcinoma.