Kidney Stone Treatment Abroad: RIRS vs PCNL Explained

RIRS involves no incision at all. A flexible instrument is passed up through the urethra, bladder and ureter into the kidney, and the stone is fragmented with a laser until it is fine enough to pass naturally.

PCNL uses a small track made through the skin of the back directly into the kidney. Because the track admits larger instruments, big stones can be broken up and physically removed in one session.

Neither is open surgery. The distinction is the route, and how much instrumentation that route allows.

Small stones favour RIRS. The stone is turned to dust, the fragments pass, and there is no wound.

As stones get larger the arithmetic changes. Dusting a large stone takes a long time, and not every fragment will pass, so a second or even third session may be needed. At that point PCNL, which clears the stone in one sitting, becomes the more sensible option.

For a patient travelling from abroad this matters more than it does for a local patient. A second session means either a longer stay or a second journey. Ask explicitly: what is the realistic chance that one session will not be enough?

Stones differ in hardness. The density value measured on CT indicates how much the stone will resist the laser. A very hard stone takes longer to dust, which lengthens the operation and raises pressure inside the kidney.

Position matters too, particularly for stones in the lower pole of the kidney. That is a dependent pocket from which fragments drain poorly, so even a well-dusted stone may leave residue behind. Lower pole stones therefore tip the balance towards PCNL at a smaller size than stones elsewhere.

In patients taking anticoagulants, because no track is made through kidney tissue.

In patients whose body habitus or spinal anatomy makes percutaneous access difficult.

In patients with a single functioning kidney, where preserving renal tissue carries extra weight.

When there is also a stone in the ureter that can be dealt with in the same session.

For large stones, and particularly for branched staghorn stones filling the collecting system.

When there are multiple stones and single-session clearance is the goal.

After a previous RIRS has failed to render the kidney stone-free.

PCNL carries a higher bleeding risk than RIRS because a track is created through the kidney. Transfusion or an additional procedure is occasionally needed, and injury to neighbouring structures, while uncommon, is recognised.

RIRS risks relate mainly to the ureter: injury from instrument passage, and ureteric stricture developing later. Raised pressure within the kidney during the procedure is also relevant to infection risk.

For both, febrile infection is the complication to take most seriously. This is why a clean urine culture before surgery is not a formality. Stone surgery should not be scheduled on infected urine, and a clinic that treats this as optional is cutting a corner that matters.

A temporary stent between kidney and bladder is often placed after either procedure. It protects drainage, but it causes its own symptoms: urinary frequency, flank discomfort when passing urine, and blood in the urine.

These symptoms stop when the stent is removed. The practical question for an international patient is who removes it and where. Removal requires a short procedure, so establish before you travel whether it will be done in Turkey before you fly or arranged at home — and if at home, that your local urologist has agreed.

Patients are often surprised by how uncomfortable a stent can be. Knowing in advance that the discomfort is expected and temporary makes a considerable difference.

A non-contrast CT is the key study: it shows size, position and density. Also send recent kidney function tests, a urine culture, your medication list and any record of previous stone treatment.

And then the part that is routinely neglected: clearing the stone is only half the treatment. Without a change in fluid intake and, where relevant, diet, stones tend to recur. Ask for the stone composition to be analysed, and for metabolic assessment if you form stones repeatedly.

This article is general information and does not replace medical advice.