21 cases of giant renal staghorn calculi underwent nephrolithotomy via incision through the inferoposterior part of. kidney and the renal pelvis inside renal sinus, which was based on renal anatomical characteristic that there were no segmental arterial trunks in the inferoposterior part. 根据肾后下部无肾段动脉主干的解剖学复习,采用肾后下部及肾窦内肾盂切开治疗巨大鹿角形肾结石21例,全部痊愈。