Three Bellini duct carcinomas (BDC) of the kidney were cytogenetically analyzed after short‐term culture. All three had clonal chromosome abnormalities: 91–92,XXY,‐Y, +12, +12, −15, −16, −18, +mar (case I); 53, XY, +2,t(2;7)(p22;q11), +der(2)t (2;7)(p22;q11), +3, +r(3), add(5)(p15), +7, −8, +12, +17, +r(17), +20, −21 (case 2); and 44–47,X,‐Y, +9, +16, −21/46,XY. Some of the numerical abnormalities are shared with papillary renal cell carcinomas (PRCC)(+7, +12, +16, +17, and +20) but not with transitional renal cell carcinomas. The present findings support the previous notion that BDC are different from other types of RCC. Genes Chromosom Cancer 15:170–172 (1996). © 1996 Wiley‐Liss, Inc.