Randomized Controlled Trial to Compare the Operative Outcomes and Complications of Mini-Percutaneous Nephrolithotomy (mini-PCNL) Versus Standard PCNL


About this study

The purpose of this study is to compare the operative outcomes and complications of mini-percutaneous nephrolithotomy (mini-PCNL) versus standard PCNL for renal stones.

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Patients with planned PCNL and a preoperative CT scan.
  • Urologist obtained access and prone positioning during surgery.
  • Tract dilation performed either using balloon dilator or a single step mini-PCNL dilation.
  • Age: ≥ 18 years old.
  • Stone size: 10-25mm.
  • Male and female patients.
  • Patients of all ethnic backgrounds.
  • Capable of giving informed consent.
  • Capable and willing to fulfill the requirements of the study.
  • Pre-existing indwelling nephrostomy tube or ureteral stent permitted.

Exclusion Criteria: 

  • Anticoagulated or history of coagulopathy (with the exception of daily 81 mg aspirin).
  • Conversion to open procedure.
  • Multiple access tracts.
  • Inability to give informed consent or unable to meet requirements of the study for any reason.

Eligibility last updated 9/21/21. Questions regarding updates should be directed to the study team contact.


Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Scottsdale/Phoenix, Ariz.

Mayo Clinic principal investigator

Mitchell Humphreys, M.D.

Open for enrollment

Contact information:

Vy Nguyen CCRP



More information


Publications are currently not available

Study Results Summary

Not yet available

Supplemental Study Information

Not yet available


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