What is the recommended management of posterior reversible encephalopathy syndrome (PRES) in cancer patients receiving chemotherapy, targeted therapy, or immunotherapy?

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Last updated: October 21, 2026 • View editorial policy

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Management of PRES in Oncology Patients

Immediately discontinue the offending anticancer therapy, aggressively control blood pressure with a target of strict normotension, and treat seizures with antiepileptic drugs—this triad forms the cornerstone of PRES management in cancer patients. 1

Immediate Management Steps

1. Discontinue Causative Therapy

Stop all anticancer therapy immediately upon PRES diagnosis. 1 This applies to chemotherapy (particularly ifosfamide, cisplatin, high-dose cytarabine, capecitabine), targeted therapies (bevacizumab, tyrosine kinase inhibitors), and immunotherapy (nivolumab). The ESMO-EONS-EANO guidelines emphasize this as a critical first step with Level V, B evidence.

2. Blood Pressure Control

Very stringent control of blood pressure is crucial when PRES is present. 1 This is the single most important intervention for reversibility:

  • Target strict normotension (not just "controlled" hypertension)
  • Monitor mean arterial pressure continuously
  • Avoid rapid drops that could compromise cerebral perfusion
  • Continue aggressive monitoring even after initial stabilization

3. Seizure Management

Administer antiepileptic treatment immediately if seizures occur (present in 60-90% of cases). 1, 2

  • Benzodiazepines are specifically recommended for symptomatic treatment 1
  • Implement seizure precautions for all patients
  • Note that successful antiepileptic taper is achievable in approximately 51% of patients after recovery 3

4. Correct Metabolic Abnormalities

Correct electrolyte imbalances if present, particularly sodium disturbances which can facilitate encephalopathy in cancer patients. 1

Diagnostic Confirmation

MRI is the diagnostic modality of choice and is significantly more sensitive than CT. 2, 3 Key findings:

  • T2-weighted/FLAIR hyperintensities in bilateral parietal-occipital lobes
  • Vasogenic edema predominating in white matter over gray matter
  • Critical pitfall: 37% of patients with confirmed PRES on MRI had normal concurrent CT scans 3—do not rely on CT alone

Expected Recovery Timeline

PRES is usually reversible with appropriate supportive management within 2 weeks. 1 The evidence shows:

  • 84% of patients return to neurologic baseline at a median of 7.5 days (range 1-167 days) 3
  • Full remission occurs in almost all cases without sequelae when managed appropriately 1
  • However, 40-44% may experience persistent neurological deficits or residual radiologic lesions if management is delayed 2

Risk Factors to Monitor

Patients at highest risk include those with: 1

  • Pre-existing arterial hypertension
  • Renal impairment
  • Autoimmune diseases
  • High-dose antineoplastic therapy
  • Allogeneic stem cell transplantation (16% of cases) 3
  • Bevacizumab exposure (common precipitant) 3
  • Immunosuppression (e.g., ciclosporin)

Rechallenge Considerations

Reintroduction of prior anticancer therapy must be decided on an individual basis. 1 The evidence shows:

  • Chemotherapy rechallenge was attempted in 41% of patients without recurrent PRES 3
  • Successful rechallenge is possible, particularly after complete resolution
  • Consider alternative regimens if the same agent must be avoided (e.g., switching from ABVD to gemcitabine BVD after anthracycline-induced complications) 4

Common Pitfalls to Avoid

  1. Attributing neurologic symptoms to other causes: In oncology patients, symptoms may initially be misattributed to metastases, stroke, or encephalitis 2, 5
  2. Relying on CT imaging alone: MRI is essential for diagnosis 3
  3. Inadequate blood pressure control: "Controlled" hypertension is insufficient—strict normotension is required 1
  4. Continuing chemotherapy: Even brief delays in discontinuation worsen outcomes
  5. Assuming irreversibility: With prompt management, mortality is 10-19% and most patients recover fully 2

Monitoring During Recovery

  • Frequent neurologic and mental status assessments 6
  • Continuous blood pressure monitoring
  • Serial neuroimaging to confirm resolution
  • Assess for complications: intracranial hemorrhage, infarction, or recurrent PRES 2

References

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