Necrosed and calcified papilla mimic stones
Elderly
Long standing diabetic and liver cirrhosis
Renal stones on ultrasound
CT Appearance:
The calculi show rim calcification with central lucency These actually represent necrosed and "sloughed off" papilla, which over the time get calcium deposits and mimic stones.
Note chronic changes in the kidney
On CT Urography, such patients will shows contrast collection at the site of sloughed papilla.
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