What are Hunner lesions, what symptoms do they cause, and how are they treated?

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Hunner Lesions: Definition, Symptoms, and Treatment

Hunner lesions are distinctive inflammatory bladder lesions seen in a specific subtype of interstitial cystitis/bladder pain syndrome (IC/BPS), and patients with these lesions should undergo endoscopic treatment (fulguration, laser ablation, or transurethral resection) as the primary therapeutic approach, as they respond significantly better to bladder-directed interventions than medical management alone. 1

What Are Hunner Lesions?

Hunner lesions are ulcerative bladder lesions characterized by:

  • A central scar with surrounding erythema
  • Reddened mucosal areas with small vessels radiating toward the center
  • Splitting of the lesion during bladder distension
  • A characteristic "waterfall bleeding" pattern when visualized 2, 3

These lesions represent a distinct pathophysiologic subtype of IC/BPS, likely driven by autoimmune-mediated inflammation with upregulation of humoral immunity and overexpression of inflammatory markers in the bladder lining 4.

Symptoms

Patients with Hunner lesions present with more severe bladder-centric symptoms compared to IC/BPS patients without these lesions:

Urinary symptoms:

  • Significantly higher urinary frequency (averaging 3.2 more voids per day than non-Hunner IC/BPS patients) 5
  • Increased nocturia (1 additional void per night) 5
  • Markedly reduced bladder capacity (113 ml less on cystometry) 5

Pain characteristics:

  • Bladder/pelvic pain and pressure
  • Discomfort associated with strong urge to urinate
  • Higher Interstitial Cystitis Symptom Index scores 5
  • Pain intensity similar to non-Hunner IC/BPS, but more bladder-focused 6

Additional features:

  • Dyspareunia (painful intercourse)
  • Dysuria
  • Symptoms present for at least 6 weeks with negative urine cultures 1

Demographic pattern: Patients with Hunner lesions tend to be older (average 6.7 years older than non-Hunner IC/BPS patients) 5

Diagnosis

Cystoscopy is mandatory for diagnosing Hunner lesions and should be performed early in patients suspected of having them, without requiring failure of other treatments first. 1

Diagnostic approach:

  • Most Hunner lesions can be identified during office flexible cystoscopy under local anesthesia without requiring hydrodistension or general anesthesia 2
  • However, cystoscopy with hydrodistension and redistention remains the gold standard for comprehensive evaluation 3
  • Lesions show variable appearances: classic lesions with/without central coagulum, inflamed or non-inflamed variants, grouped lesions, or red waterfall bleeding patterns 2

Key diagnostic principle:

The 2022 AUA guidelines emphasize that Hunner lesions are the only consistent cystoscopic finding that leads to a definitive IC/BPS diagnosis 1. Early cystoscopic diagnosis is critical because these patients respond dramatically to treatment.

Treatment

Primary Treatment: Endoscopic Intervention

Endoscopic treatment of Hunner lesions is the most effective approach, with 78.2% achieving complete pain resolution compared to only 11.1% with medical management alone. 7

Treatment options include:

  1. Transurethral resection (TUR) of lesions - most definitive
  2. Fulguration (electrocautery ablation)
  3. Laser ablation
  4. Triamcinolone (corticosteroid) injection into lesions 2, 3

Treatment Algorithm:

First-line: Endoscopic ablation/resection of visible Hunner lesions 1, 7

For recurrence (occurs in 61% of patients, median 13 months): Repeat endoscopic treatment 7

  • Most patients require 2-3 procedures over time
  • Each intervention typically provides significant symptom relief

Adjunctive medical therapy:

  • Oral cyclosporine A shows superior efficacy in Hunner lesion patients compared to non-Hunner IC/BPS 5
  • Bladder instillations (RIMSO/DMSO) may provide some benefit 7
  • Systemic corticosteroids (prednisolone) for severe cases, particularly with upper tract involvement 8

Important Caveats:

Surgical complications occur in approximately 12.5% of cases:

  • Bladder perforation requiring repair (6%)
  • Gross hematuria requiring reintervention
  • Ultimately, 12.5% may require cystectomy for refractory disease 7

Pollakiuria (frequency) improvement: Only 34.8% of patients experience resolution of urinary frequency despite pain improvement, so counsel patients that bladder-directed treatment primarily targets pain 7

Upper tract monitoring: Rare cases show ureteral involvement with stenosis and hydronephrosis, warranting periodic upper tract imaging in patients with persistent symptoms 8

What NOT to Do:

Do not delay cystoscopy in suspected Hunner lesion patients by requiring them to fail behavioral or medical treatments first—this only prolongs suffering when effective endoscopic treatment is available 1. The 2022 AUA guidelines explicitly changed this approach from prior versions.

Medical management alone (cimetidine, pentosan polysulfate, bladder instillations) shows poor efficacy for Hunner lesion disease and should not be the primary strategy 7.

References

3
Research

Hunner lesion versus non-Hunner lesion interstitial cystitis/bladder pain syndrome.

International journal of urology : official journal of the Japanese Urological Association, 2019

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.