The ability to selectively catheterize and embolize arteries supplying bleeding points is being used with increasing frequency. The technique has been used successfully to control bleeding following renal biopsy (Bookstein and Goldstein, 1973; Rizk et al., 1973) and in the pre-operative treatment of renal adenocarcinoma (Almgard et al., 1973; Goldstein et al., 1975b). This report describes the selective catheterization of the right renal artery and injection of barium sulphate to stop bleeding from a renal neoplasm.