Ball on tee sign (kidney)

Last revised by Dr Daniel J Bell on 16 Dec 2021

The ball-on-tee sign, golf ball-on-tee sign, or egg in cup appearance, refers to a urographic pattern of papillary excavation that may be seen with renal papillary necrosis.

The sign occurs when contrast material fills central excavations in the papilla of the interpolar region giving a ball-on-tee appearance. 

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