The rim sign in renovascular compromise may be defined as a thin nephrographic rim outlining a kidney with an otherwise faint nephrogram. Renal infarction with gelform and blood clots was induced experimentally in 5 dogs and high dose IVP and CT were performed to evaluate renal cortical rim sign after renal infarction. One expired due to anesthetic technical failure, and one was embolized partially. So we could be obtain the result on 3 dogs. The results were as follows : 1. The high dose IVP films show cortical rim sign on 24 hrs and 72 hrs films in t재 dogs. The C-T films show rim sign in 3 dogs. 2. The rim sign may be visualized, if the renal artery is occuluded to drop perfusion pressure below the authoregulatory range. 3. The high dose IVP and early nephrogram phase are necessary for the rim sign.