In our current practice, the use of JJ probes has become extremely frequent. However, incrustation and fragmentation of JJ leads are still relatively common and sometimes complicate removal. A 61-year-old woman with a history of hysterectomy ten years ago, she had a double J endo-ureteral stent for preoperative identification of the right ureter. The patient has forgotten the double J stent. She currently has right lower back pain and urinary tract symptoms of urinary. Uroscan revealed a very important right hydronephrosis, a fully calcified right double J stent with a calcification of 6 cm at the level of the lower loop. She had, at first, a cystotomy allowing the extraction of the lower part of the calcified stent and secondly a pyelotomy to extract the rest of the double J stent. The operative follow-up was simple. The use of a double J probe to divert the urinary tract is an effective and generally well tolerated technique. Regular monitoring prevents complications.