IN-DEPTH ACUTE CONSULTATION · 15 MINUTES + 5 MINUTES DISCUSSION
Progressive weakness in metastatic cancer
Fictional Clinora training simulation. Source and safety audit completed after correction of the supplied Claude draft. Independent specialist validation of difficulty and scoring has not been performed. Not an official MRCP(UK) station, a validated pass prediction or patient-specific medical advice.
Learning objectives
- Recognise metastatic spinal cord compression before paraplegia.
- Localise cord versus cauda-equina disease using history and examination.
- Start emergency treatment before imaging when neurological signs are present.
- Explain urgent surgery/radiotherapy decisions without promising neurological recovery.
Candidate brief
Martin has metastatic prostate cancer, progressive thoracic back pain and new leg heaviness. Assess him, localise the neurological syndrome and state your actions for the next two hours.
Rehearse aloud before revealing teaching material. Use 15 minutes for the encounter and five minutes for examiner questions 1, 2 and 6. The other questions are teaching extensions. In a real emergency, assessment and escalation take priority over any timer.
Patient encounter: Martin Whitcombe, 68
My legs feel as if they belong to somebody else, and I could barely reach the bathroom this morning.
Only if asked: pain
Six weeks of progressive mid-thoracic pain, now severe at night and worse with coughing or straining, with a band around the trunk. It is new and different from longstanding lumbar ache.
Only if asked: neurology and function
Three days of heavy legs, stumbling and reduced walking distance; today he needed furniture and help. Ask exactly when he last walked unaided and how fast function is changing.
Only if asked: bladder, bowel and saddle symptoms
He has not passed urine for ten hours and assumed his prostate was responsible. No faecal incontinence or saddle numbness. These questions must be asked directly; patients may not volunteer them.
Cancer, infection and concerns
Known metastatic prostate cancer on systemic treatment. Ask about fever, recent procedures, immunosuppression, bacteraemia risk and anticoagulation because epidural abscess or haematoma can mimic compression. He asks whether the cancer has progressed and whether he will walk again.
Examination: findings and interpretation
Ask permission, preserve dignity and describe what you would examine and why. Reveal the relevant findings only after doing so.
Neurological localisation
Upper limbs and cranial nerves are normal. Legs show pyramidal weakness, increased tone, brisk reflexes, ankle clonus and extensor plantars. Pinprick reveals a thoracic sensory level. This is a spinal-cord pattern, not isolated root disease.
Spine, gait and bladder
Focal thoracic vertebral tenderness; avoid repeated flexion or painful manipulation. Gait is unsafe and should not be tested unsupported. A palpable bladder is confirmed by bedside scan at 640 mL. Perianal sensation and anal tone are normal when examined with consent and a chaperone.
Investigation cards
State your next action before opening each card. Later results are not information available at the start of the encounter.
Immediate imaging
Contact the MSCC coordinator and request MRI of the whole spine as soon as possible and within 24 hours; overnight scanning is used when the result is needed to start immediate treatment. MRI must include whole-spine sagittal and targeted axial sequences. If MRI is contraindicated, use CT; plain radiography cannot exclude MSCC.
Supporting work-up
Check FBC, renal and liver profile, calcium, glucose, coagulation, inflammatory markers and group/save as clinically indicated. Look for infection and treatment complications, but do not delay the MSCC pathway. Catheterise retention and record neurological function serially.
Worked consultation and clinical reasoning
Working diagnosis and first actions
This is suspected metastatic spinal cord compression with neurological signs and urinary retention: an oncological emergency. Contact the MSCC service now, admit, protect the spine when instability is suspected, treat pain, catheterise and document baseline power, sensation and sphincter findings.
Dexamethasone before imaging
Offer 16 mg oral dexamethasone or equivalent parenteral dose as soon as possible because neurological signs are present; continue the guideline dose while awaiting surgery or radiotherapy and taper at the appropriate treatment point. If imaging excludes MSCC, discontinue. Monitor glucose and provide acid suppression as NICE advises.
Imaging, stability and mobilisation
Keep movement to the minimum required for comfort and care when instability is suspected. Seek stability advice within 24 hours to avoid unnecessarily prolonged immobilisation. Graded sitting and weight bearing begin only when assessment suggests stability.
Definitive decision and communication
Spinal surgery and oncology decide urgently between decompression/stabilisation and radiotherapy based on neurological trajectory, stability, disease biology, prognosis and patient goals. Say plainly that cancer progression is a likely explanation but MRI is needed. Treatment aims to preserve or improve function; do not guarantee walking recovery.
Examiner discussion
Five-minute subset: questions 1, 2 and 6. Give your answer first, then compare the reasoning.
1. Why not wait for MRI before dexamethasone?
Reveal worked answer
NICE directs steroid treatment as soon as possible when neurological symptoms or signs of MSCC are present and explicitly provides for discontinuation if imaging rules it out.
2. Why image the whole spine?
Reveal worked answer
Spinal metastases may be multifocal and the clinical level is not sufficiently reliable to restrict imaging. Whole-spine sagittal sequences plus targeted axial images are recommended.
3. When would you seek haematology advice before steroids?
Reveal worked answer
When imaging suggests lymphoma or myeloma with spinal metastases but there are no neurological symptoms or signs, because corticosteroids can compromise tissue diagnosis. That exception does not fit this patient’s neurological emergency.
4. What determines surgery versus radiotherapy?
Reveal worked answer
Neurological decline, mechanical stability, degree and site of compression, tumour sensitivity, fitness, prognosis and goals are considered through the MSCC MDT. Avoid using a score in isolation.
5. Would a normal plain X-ray reassure you?
Reveal worked answer
No. NICE says not to use plain X-ray to diagnose or rule out spinal metastases or MSCC.
6. How do you answer ‘Will I walk?’
Reveal worked answer
Acknowledge the fear, explain that earlier treatment offers the best chance of preserving function, describe current uncertainty and avoid guarantees. Offer to involve his chosen family member with consent.
What changes if…?
Each variation changes the baseline case. Explain both what changes in management and what remains important.
MRI confirms compression and surgery is unsuitable
Arrange urgent radiotherapy as soon as possible and within the guideline timeframe after the decision to treat, unless a stated exception applies. Continue supportive, steroid and rehabilitation planning.
There is no known primary cancer
The neurological emergency is unchanged. Investigate the primary and obtain image-guided biopsy only if it will change treatment and immediate decompression is not required; surgery may provide tissue when treatment cannot wait.
Legs are flaccid with saddle anaesthesia
This localises toward cauda-equina compression. Whole-spine emergency imaging, dexamethasone, catheterisation and urgent specialist involvement remain necessary; anatomy changes the operative approach.
MRI suggests lymphoma but neurology is normal
Seek specialist haematology advice before starting corticosteroids because steroid-induced lysis may impair diagnosis. New neurological signs would alter that balance urgently.
Case-specific reflection
Formative Clinora anchors, not official PACES marks. Identify one missed decision and one communication improvement, then repeat the encounter.
Recognition
Strong: Names MSCC and activates the pathway immediately.
Incomplete: Says urgent scan without named coordination.
Unsafe: Treats as mechanical back pain.
Examination
Strong: Localises the lesion and checks bladder/sphincter function safely.
Incomplete: Reports only leg weakness.
Unsafe: Repeatedly mobilises or flexes a potentially unstable spine.
Treatment
Strong: Gives dexamethasone before imaging and states monitoring.
Incomplete: Waits for MRI despite neurological signs.
Unsafe: Discharges for outpatient imaging.
Communication
Strong: Explains urgency and uncertainty without guaranteeing recovery.
Incomplete: Avoids the progression question.
Unsafe: Promises that treatment will restore walking.