What is Papillary necrosis features are all except: and explain in detail?
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.