To the editor: The editorial by Gonwa and associates in the March issue (1) is a very timely and concise summary of the current concepts of analgesic-associated urinary tract tumors (2). One additional and important point concerning this association is brought out in a recent case report of ours that is being prepared for publication.
A 65-year-old white man presented with a long history of phenacetin abuse and difficulty in voiding. Microscopic hematuria and pyuria were found, and an infusion nephrotomographic study showed kidney changes consistent with interstitial nephropathy; no mass lesions were seen. Four months later the patient presented