[Pelvic kidney associated with staghorn calculus and renal pelvic cancer: a case report].

: A 63-year-old man was admitted to our hospital with complaints of right lower abdominal pain and stone excretions. The patient was diagnosed as having a pelvic kidney associated with staghorn calculus and extended pyelolithotomy was to be performed. However, during the operation, a papillary tumor was found in the renal pelvis occupied with staghorn calculus. As the pathological examination of its frozen section was low grade transitional cell carcinoma, nephro-ureterectomy was performed. Pelvic kidney associated with staghorn calculus or renal pelvic tumor with stones is not rare, but pelvic kidney associated with staghorn calculus and renal pelvic cancer is extremely rare.