Horseshoe Kidney with Stones | Pristyn Care

Risk Factors

Risk factors for stone formation in horseshoe kidneys include:

• Congenital urinary stasis from the abnormal anatomy
• Associated PUJ obstruction causing further drainage impairment
• Recurrent urinary tract infections
• Metabolic disorders including hypercalciuria and hypocitraturia
• Low fluid intake in a kidney with already poor drainage
• Previous stone episodes in the horseshoe kidney

Who is at Risk

Patients with a known diagnosis of horseshoe kidney have a lifelong risk of stone formation. Those with associated PUJ obstruction, recurrent infections, or metabolic stone-forming conditions are at highest risk. Regular surveillance imaging is essential to detect stone formation early.

Diagnosis

Diagnosis of stones in horseshoe kidneys involves:

• Non-contrast CT scan to identify stone location, size, and relation to altered anatomy
• CT urogram to assess collecting system anatomy and drainage pattern
• MAG-3 or DTPA diuretic renogram to assess for associated PUJ obstruction
• Urine culture to detect associated infection
• Metabolic workup to identify treatable risk factors for recurrence
• 3D reconstruction imaging to plan surgical access routes

Stone Treatment in Horseshoe Kidney

ESWL has lower success rates in horseshoe kidneys due to impaired fragment drainage. PCNL using prone or modified access positions can effectively remove stones but requires careful planning due to altered calyceal anatomy. Ureteroscopy with flexible laser lithotripsy is effective for accessible stones. Open or laparoscopic surgery is reserved for complex cases with associated PUJ obstruction requiring simultaneous correction.

Stone Removal Procedure in Horseshoe Kidney

Stone removal in horseshoe kidney is performed as follows:

• Preoperative CT and 3D planning to map calyceal anatomy and optimal access route
• PCNL performed in prone or modified position using ultrasound and fluoroscopic guidance
• Flexible nephroscopy to access stones in multiple calyces
• Ureteroscopy with holmium laser for ureterally accessible stones
• Simultaneous pyeloplasty if associated PUJ obstruction is present
• A nephrostomy tube is placed for postoperative drainage
• Post-procedure imaging to confirm stone clearance
• Metabolic evaluation and long-term prevention plan

After Surgery Care

Post-operative care after stone surgery in horseshoe kidney includes:

• Nephrostomy tube management and removal when output clears
• Ureteral stent removal at 2 to 4 weeks if placed
• Adequate hydration to support urinary drainage
• Follow-up imaging to assess stone clearance and residual fragments
• Metabolic workup to identify and treat stone-forming risk factors
• Regular surveillance to detect new stone formation early

Complications of Stone Surgery in Horseshoe Kidney

Complications of stone surgery in horseshoe kidney include:

• Bleeding during PCNL due to altered vascular anatomy
• Injury to the isthmus or fused lower poles during surgical access
• Residual stone fragments due to difficulty accessing all calyces
• Urinary tract infection or sepsis
• Damage to adjacent structures including bowel or vessels
• Failure of stone clearance requiring repeat procedures
• Persistent obstruction from associated PUJ narrowing