The urgent task is to confirm raised pressure, detect field loss and protect sight.
Brain imaging for suspected papilloedema must include venography to exclude cerebral venous sinus thrombosis.
Headache, transient visual greying and swollen optic discs can arrive with one apparently reassuring feature: the patient still reads the acuity chart. Visual acuity may remain preserved until late in papilloedema, while peripheral field loss develops earlier. Waiting for visual acuity to fall risks missing the point at which sight is already threatened.
Confirming papilloedema
Papilloedema has a precise meaning: optic disc swelling caused by raised intracranial pressure. Before pressure is established, “suspected papilloedema” is the safer description. Buried optic disc drusen, crowded or tilted discs, myelinated nerve fibres and other structural variants can all produce an elevated appearance.
The assessment needs more than a quick look through an undilated pupil. Record acuity, colour vision, pupils and cranial nerves, then obtain dilated fundoscopy and formal visual fields. A markedly enlarged blind spot, nasal step or peripheral constriction is clinically important even when acuity remains good. A relative afferent pupillary defect is unusual in symmetrical raised intracranial pressure and should raise concern about severe asymmetric optic nerve dysfunction or another diagnosis.
Optical coherence tomography (OCT) helps grade and monitor swelling, but the automated retinal nerve fibre layer number is not enough. Segmentation errors can distort the result. Review the volume scan and macular images for fluid within or beneath the nerve, hyperreflective spots and fluid tracking towards the macula.
Protecting vision while finding the cause
Symptoms alone do not prove raised intracranial pressure, but their trajectory helps establish urgency. Transient visual obscurations at rest and increasing pulse-synchronous tinnitus are warning signs. Baseline documentation matters because deterioration may be seen in the fields before it appears on the acuity chart.
The initial work-up should include blood pressure, glucose, full blood count and urea and electrolytes. Review medicines, supplements and symptoms of sleep apnoea. Brain imaging must assess for a space-occupying lesion and include venography to exclude cerebral venous sinus thrombosis. Postponing venous imaging leaves an important secondary cause unresolved.
Formal fields and disc severity decide when investigation becomes an emergency. Worsening field loss, haemorrhages, cotton-wool spots or fluid tracking towards the macula require immediate specialist escalation. A single lumbar puncture is not a durable bridge because pressure can recur within hours; temporary lumbar drainage may be needed when definitive intervention is delayed.
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Borderline serum vitamin B12 should be interpreted alongside the neurological phenotype, absorption risks and renal function. Methylmalonic acid is the more specific functional marker, while homocysteine is supportive but can rise for several other reasons.
Raised intracranial pressure must be confirmed before optic disc swelling is labelled papilloedema. Dilated examination, formal visual fields, optical coherence tomography quality review and urgent brain imaging with venography determine both the diagnosis and the threat to vision.
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Document headache trajectory, transient visual obscurations, pulse-synchronous tinnitus and baseline visual change. Arrange dilated disc assessment, formal visual fields and optical coherence tomography rather than relying on an undilated direct ophthalmoscopy view. Escalate worsening fields or severe disc features immediately.
An adult presents with escalating headache, brief bilateral greying of vision and pulse-synchronous tinnitus. Bilateral elevated optic discs are seen, but neuroimaging and pressure measurement have not yet confirmed raised intracranial pressure. Which diagnostic term should be documented?
Suspected papilloedema. Papilloedema strictly means optic disc swelling caused by confirmed raised intracranial pressure.
An adult has progressive sensory ataxia and distal paraesthesia. Serum vitamin B12 is borderline, the full blood count is normal and clinical suspicion remains high. Which additional test is most useful?
Methylmalonic acid. It is the more specific functional marker of vitamin B12 deficiency, although renal impairment can reduce its specificity
An adult with a suspected distal common bile duct stone becomes pain-free and the liver enzymes almost normalise. There is no cholangitis, and the patient can tolerate magnetic resonance imaging. Which investigation should come before therapeutic endoscopy?
Magnetic resonance cholangiopancreatography. Improving symptoms and liver tests lower the likelihood of a retained stone, so non-invasive confirmation is appropriate before endoscopic retrograde cholangiopancreatography.
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