Uncategorized CT Papillary NecrosisCT urogram in the coronal plane using bone windows shows evidence of papillary necrosis in 2 right upper pole calyces characterized by ?golf ball on a tee? sign. This sign is also called the ?lobster claw? signAshley Davidoff MD TheCommonVein.net 135424c CT Papillary Necrosis40-year-old female with SLE and NSAID use presents with hematuria. CT with contrast in the axial plane during the excretory shows evidence of a filling defect in a contrast filled right renal calyx, resulting in a ?lobster claw? appearance of the calyx characteristic of papillary necrosisAshley Davidoff MD TheCommonVein.net 113597c