Bladder Tumour Surgery: Conventional TURBT and Laser En-Bloc Resection Compared

อัปเดตล่าสุด: 28 สิงหาคม 2569

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A bladder tumour is removed through a telescope passed along the urethra — no incision. There are two ways of doing it, and the difference between them matters more to the pathologist than most patients realise.

Before the techniques, one thing worth saying plainly: the operation is the beginning of treatment, not the end of it. That part was missing from the earlier version of this article and is covered further down.

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The conventional operation

Conventional resection uses an electrical loop to shave the tumour away in fragments, sometimes many of them. It is effective, it is available everywhere, and it has two well-recognised drawbacks.

The first is the obturator reflex. The electrical current can stimulate a nerve running beside the bladder, causing the leg to jerk involuntarily at the moment of cutting — with the loop inside the bladder wall. That is how a bladder gets perforated, and a significant perforation can turn a telescope operation into an open one.

The second is the specimen. A tumour removed in fragments, with the edges cauterised, is harder for the pathologist to read — and the single most important question, whether the tumour has invaded the muscle of the bladder wall, depends on having that muscle present and interpretable in the sample.

Laser en-bloc resection

Instead of shaving the tumour away, the holmium laser cuts around and beneath it, lifting it out whole with the base attached. The pathologist receives an intact specimen with an orientated deep margin.

• A better specimen — muscle reliably present, margins readable, and staging correspondingly more confident. This is the strongest argument for the technique.
• Less bleeding, since the laser seals as it cuts.
• The obturator reflex is removed as a cause of perforation, because laser energy does not stimulate the nerve. The earlier version said the risk is eliminated; perforation can still occur mechanically, so the accurate statement is that this particular mechanism is removed rather than that perforation becomes impossible.
• Shorter catheter time and hospital stay, and fewer irritative symptoms afterwards.

What it does not suit, and what is not yet established

Both points were absent from the earlier version, which listed only a learning curve and equipment cost as drawbacks.

En-bloc removal is limited by tumour size. A tumour has to come out through the urethra in one piece, so the technique suits smaller tumours — broadly those under about three centimetres — and larger or multiple tumours are still better handled by conventional resection. The right operation depends on the tumour, not on which equipment the hospital owns, and a page comparing the two should say so.

And on outcomes: the specimen advantage is well demonstrated. Whether en-bloc resection reduces recurrence or improves survival is not established — the evidence so far shows comparable oncological results rather than superiority. Better staging is a real benefit, since it means fewer men are under-treated or over-treated; it is not the same as living longer, and it should not be sold as such.

The remaining limitations stand: it needs a laser system, and it needs a surgeon who has done enough cases — on the order of twenty-five — to be proficient.

What happens after the operation

None of this was in the earlier version, and for a man who has just been told he has a bladder tumour it matters far more than the choice of instrument.

• A single dose of chemotherapy into the bladder is often given within hours of the operation, which reduces the chance of the tumour coming back.
• A second look operation is recommended for certain tumours — high-grade disease, or where muscle was absent from the specimen. This is where specimen quality earns its keep: a good en-bloc specimen can spare a man a second anaesthetic.
• A course of treatment instilled into the bladder over months, for higher-risk non-muscle-invasive disease.
• Where the tumour has invaded muscle, telescope surgery is not the treatment and the conversation moves to removing the bladder or to radiotherapy with chemotherapy.
• Lifelong surveillance. Bladder cancer recurs — this is its defining behaviour — so repeat cystoscopy on a schedule for years is part of the treatment rather than an optional check-up. Men who stop attending are the ones who present again with something worse.

And the single most useful thing a patient can do: stop smoking. Smoking is the dominant cause of bladder cancer, and continuing after diagnosis is associated with more recurrence and worse outcomes. It is the one part of this that is entirely in the patient’s hands.

Symptoms that need attention rather than waiting for an appointment

ในกรณีฉุกเฉินในประเทศไทย โทร 1669.

• Visible blood in the urine that has not been investigated — this is how bladder cancer usually announces itself, and painless bleeding is more concerning rather than less. See ปัสสาวะเป็นเลือด.
• Clots blocking the flow, or inability to pass urine.
• Fever or shaking chills after a bladder operation, or heavy bleeding.
• Severe lower abdominal pain after resection, which may indicate perforation.
• A surveillance appointment you have let lapse. Not urgent today, and the most consequential item on this list.

คำถามที่พบบ่อย

What is the difference between conventional and en-bloc resection?

Conventional resection shaves the tumour away in fragments with an electrical loop. Laser en-bloc resection cuts around and beneath it, removing it whole with its base. The en-bloc specimen is easier for the pathologist to read, particularly for the crucial question of whether the tumour has invaded the bladder muscle.

Is the laser technique better?

Better in specific ways — specimen quality, less bleeding, removal of the obturator reflex as a cause of perforation, shorter stay. It is not better for every tumour: en-bloc removal is limited by size, so larger or multiple tumours are still better handled conventionally. Whether it reduces recurrence or improves survival is not established; the evidence shows comparable oncological outcomes.

What is the obturator reflex?

Electrical current during conventional resection can stimulate a nerve beside the bladder, causing the leg to jerk while the cutting loop is against the bladder wall — a recognised cause of perforation. Laser energy does not trigger it, which removes that mechanism, though perforation remains possible mechanically.

Is the operation the whole treatment?

No. A single dose of chemotherapy into the bladder is often given straight afterwards, a second look operation is recommended for certain tumours, higher-risk disease is treated with a course of instillations, and muscle-invasive disease requires quite different treatment. Lifelong surveillance cystoscopy follows, because bladder cancer recurs.

Does it matter if I keep smoking?

Yes, considerably. Smoking is the dominant cause of bladder cancer and continuing after diagnosis is associated with more recurrence and worse outcomes. It is the part of this entirely within your control.

การนัดหมายเพื่อปรึกษา

Dr. Soarawee Weerasopone is a board-certified urologist with fellowship training in robotic and minimally invasive urological surgery at Chang Gung Memorial Hospital, Taiwan, and sees patients at โรงพยาบาลกรุงเทพ สำนักงานใหญ่ และที่โรงพยาบาล สมิติเวช ศรีราชา ในจังหวัดชลบุรี เมื่อวันที่ 088-022-1445. Bring any previous cystoscopy findings, pathology reports and imaging — the pathology report in particular determines what happens next.

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