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To the editor:Kidney foreign body mainly comes from gastraintestinal but not urogenital tract.Herein we report a case of needle in the kidney migrated from urethra.The patient presented with gross hematuria and fever for 1 month.He put an ancupuncture needle and thermometer into the urethra 9 years ago.Imaging examination revealed the needle has already migrated to the right kidney.He received percutaneous nephroscopy and cystoscopy to remove the objects and recovered well.To our knowledge,we present the most amazing phenomenon and challenging surgery to do with this uncommon foreign body in kidney.