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Brain tumour misdiagnosis

Brain Tumour Misdiagnosis Claims: When a Delayed Diagnosis Allows a Tumour to Grow

When neurological red-flag symptoms are repeatedly attributed to benign causes without appropriate imaging, a brain tumour can grow for months or years before diagnosis, worsening prognosis and treatment options.

Reviewed by Independent editorial panelLast reviewed April 2026 · Next review October 2026

Why brain tumours are misdiagnosed

Primary brain tumour symptoms are often non-specific in the early stages:

  • Headache — often attributed to tension headache, migraine, or sinusitis
  • Nausea and vomiting — often attributed to gastrointestinal causes
  • Visual disturbance — often attributed to an ophthalmic cause
  • Fatigue and personality change — often attributed to depression or stress
  • Focal neurological signs — sometimes attributed to an orthopaedic or musculoskeletal cause
  • Seizures — may be the presenting feature of a glioma

The key question is whether, given the pattern of symptoms and their progression, a competent GP or specialist would have arranged brain imaging.

Clinical standards for investigating suspected brain tumour

NICE guidance (NG12 — Suspected Cancer Recognition and Referral) provides that:

  • Adults with new onset seizures should be referred for urgent brain imaging
  • Adults with progressive or unexplained focal neurological deficit should be referred for urgent brain imaging
  • Adults with headache that is new, progressive, or associated with neurological features should be considered for brain imaging
  • Children and adults with symptoms suggesting raised intracranial pressure require urgent assessment

Common scenarios in brain tumour misdiagnosis claims

Headaches attributed to migraine without adequate investigation

A patient with new onset or changing pattern headache sees their GP multiple times over months or years. Each consultation results in a diagnosis of migraine and treatment with analgesia. No brain imaging is arranged. The patient eventually has a seizure or develops a neurological deficit, at which point MRI reveals a brain tumour.

Seizure misattributed to another cause

A patient presents with a first seizure. Investigation is incomplete. No brain MRI is performed. The seizure is attributed to alcohol, sleep deprivation, or a metabolic cause. A brain tumour is found months later.

Visual disturbance not investigated for pituitary tumour

A pituitary adenoma compressing the optic chiasm causes a characteristic bitemporal field defect. Where this is missed on visual field testing, or where the patient is not referred for investigation, a delayed pituitary tumour diagnosis may result.

Metastatic brain tumour in a patient with known primary cancer

In a patient with known cancer — lung, breast, melanoma, renal, colorectal — neurological symptoms should trigger consideration of brain metastases. Failure to investigate in this context falls below the required standard.

What do you need to prove?

  1. Breach of duty — the GP or specialist failed to investigate neurological symptoms that a competent clinician would have investigated.
  2. Causation — the delay in diagnosis allowed the tumour to grow to a point where it caused additional harm, whether through increased symptoms and disability, reduced treatment options, or a materially worse prognosis.
  3. Damage — additional harm caused by the delay.

Causation in brain tumour cases requires expert oncological and neurosurgical evidence on what difference earlier diagnosis would have made — to treatment options, prognosis, and quality of life.

Frequently asked questions

Can I claim if a brain tumour was diagnosed late because my GP did not arrange a scan?

Yes — if the pattern of symptoms was such that a competent GP would have referred for imaging, and the delay caused harm by allowing the tumour to grow.

What if the tumour is incurable — can I still claim?

Yes. Even where a tumour is ultimately incurable, a delay in diagnosis may have reduced quality of life during the delay period, deprived the patient of treatment that would have prolonged life, or caused greater suffering. The claim is assessed on the harm caused by the delay.

Can a family member claim if someone died from a brain tumour that was diagnosed late?

Yes. Fatal claims under the Fatal Accidents Act 1976 and the Law Reform Act 1934 are available.

Related guides

Sources & further reading

Primary statute, case law and regulator guidance referenced in this article.

  1. NICE NG12 — Suspected cancer: recognition and referral — NICE
  2. Fatal Accidents Act 1976 — UK Legislation
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