<prompt> Papillary necrosis features are all except:Egg in cupHyperdense nephrogramCalyceal hornsRing shadows  <response>: B i.e. Hyperdense nephrogram Characteritic IVP features of papillary necrosis include ball in cup or egg in cup configuration, signet ring sing or ring shadow of papilla, lobster clew sign, club shaped saccular calyxQ, amputated calyces, multiple cavities, nonopaque filling defects and diminished density of contrast material in nephrogramQ. 