Extracorporeal shockwave lithotripsy in anomalous kidneys

Area of Science:

• Urology
• Nephrology
• Surgical Technology

Background:

• Traditionally, surgical intervention (open or percutaneous) was the primary method for removing kidney stones in anomalous renal structures.
• Anatomical variations such as horseshoe kidneys, pelvic ectopic kidneys, and malrotated kidneys present unique challenges for stone management.

Purpose of the Study:

• To evaluate the efficacy and outcomes of Extracorporeal Shockwave Lithotripsy (SWL) for treating kidney stones in patients with specific renal anomalies.
• To determine the suitability of SWL as a primary treatment modality for stones in horseshoe, pelvic ectopic, and malrotated kidneys.

Main Methods:

• A cohort of patients with kidney stones in anomalous kidneys (horseshoe, pelvic ectopic, malrotated) underwent treatment using the Dornier MPL 9000 lithotripter.
• Data collected included stone-free rates, need for repeat treatments, and outcomes for residual fragments.

Main Results:

• Extracorporeal shockwave lithotripsy (SWL) achieved stone-free status in 65% of patients across all groups, with 24% having asymptomatic residual fragments.
• Seventy-one percent of patients required repeat SWL treatments.
• SWL demonstrated significant success for stones in horseshoe and malrotated kidneys but was found to be less effective for stones in most pelvic ectopic kidneys.

Conclusions:

• Extracorporeal shockwave lithotripsy (SWL) is a viable and preferred treatment option for kidney stones in horseshoe and malrotated kidneys.
• SWL is not recommended as a primary treatment for stones in the majority of pelvic ectopic kidneys due to limited efficacy.
• Further investigation may be warranted for optimizing SWL or exploring alternative treatments for stones in complex renal anomalies.