Kidney Calyx Ball on a Tee sign aka Lobster Claw Sign Papillary Necrosis (CT)

1. Findings


CT Papillary Necrosis
CT 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” sign
Ashley Davidoff MD TheCommonVein.net 135424c