Treatment of Lower Pole (Inferior Calyx) Kidney Stone 10–20mm with No Unfavourable SWL Factors

This protocol addresses a kidney stone located in the lower pole (inferior calyx), measuring 10–20mm in diameter, in a patient without anatomical or stone-composition features known to impair shock wave lithotripsy outcomes.

Clinical scenario

Stone location: lower pole / inferior calyx
Stone diameter: 10–20 mm
No unfavourable SWL factors present — no steep infundibulopelvic angle, no long calyx, no long skin-to-stone distance, no narrow infundibulum, and no shock wave-resistant stone composition

Treatment approach

The management strategy for this presentation involves either extracorporeal shock wave lithotripsy (SWL) or an endourological approach — the structured protocol specifies the selection criteria and procedural guidance.

The full regimen — including the decision logic between treatment modalities — is available via the link below.

Instant Access to Structured Evidence-Based Regimens

References

The stone clearance rate after SWL seems to be lower for stones in the inferior calyx than for other intrarenal locations.

The following can impair successful stone treatment by SWL: steep infundibular-pelvic angle; long calyx; long skin-to-stone distance; narrow infundibulum; and shock wave-resistant stones (calcium oxalate monohydrate, brushite or cystine).

Perform PCNL or retrograde intrarenal surgery for the lower pole, even for stones > 1cm, as the efficacy of SWL is limited (depending on favourable and unfavourable factors for SWL).

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