In a 75-year-old man with metastatic prostate carcinoma and multifocal vertebral metastases previously treated with radiotherapy, who now reports new sternum and lower‑rib pain radiating from the back after overexertion (painting), what immediate evaluation and management should be undertaken?

Urgent MRI of the Spine is Mandatory

This patient requires urgent MRI of the spine within 12 hours to rule out spinal cord compression, followed by immediate initiation of high-dose dexamethasone if compression is confirmed. 1, 2, 1

Immediate Evaluation Algorithm

Step 1: Neurological Assessment (Now)

Examine specifically for:

• Lower extremity motor strength (hip flexion, knee extension, ankle dorsiflexion)
• Sensory level on trunk and legs
• Rectal tone and perianal sensation
• Bladder function (urinary retention or incontinence)
• Deep tendon reflexes and pathological reflexes (Babinski sign)

Critical point: The absence of back pain does NOT exclude spinal cord compression—32% of prostate cancer patients with vertebral metastases have occult spinal cord compression on MRI despite normal neurological examination 3. The new sternum and rib pain radiating from the back in a patient with known vertebral metastases is a red flag requiring urgent imaging regardless of neurological findings.

Step 2: Urgent Imaging (Within 12 Hours)

• MRI of entire spine with and without contrast 1, 2, 4
  • This is the gold standard for detecting epidural disease and cord compression
  • Must image the entire spine, not just symptomatic areas, as 13% have compressions at discontinuous levels 3
  • CT is insufficient—it cannot adequately evaluate epidural extension or cord compression

Step 3: Immediate Medical Management

If MRI shows spinal cord compression:

• Start dexamethasone 16 mg IV/PO immediately (do not wait for imaging if high clinical suspicion with neurological deficits) 2, 4
• Taper over 2 weeks after definitive treatment
• Urgent radiation oncology and neurosurgery consultation within 24 hours 2, 5

If MRI shows uncomplicated bone metastases without cord compression:

• Initiate analgesic therapy following WHO ladder 6, 7
• Consider single-fraction radiotherapy (8 Gy) for painful bone metastases—provides 70-80% overall response rate with complete pain relief in one-third of patients 1, 4
• Start or continue bone-targeted agents: denosumab or zoledronic acid to prevent skeletal-related events 1, 8

Why This Approach is Critical

The ESMO guidelines provide Level III, Grade A evidence that urgent MRI is very strongly recommended in men with castrate-resistant prostate cancer with vertebral metastases and neurological symptoms 1. However, this patient's new pain pattern in the context of known vertebral disease warrants urgent evaluation even without overt neurological deficits, as:

1. Early diagnosis is the most powerful predictor of outcome in spinal cord compression 2
2. Patients with neurological deficits have poor prognosis—once paralysis develops, it may be irreversible 2
3. Pain precedes neurological deficits by days to months in 95% of cases 2

Common Pitfalls to Avoid

• Do not assume musculoskeletal strain from overexertion in a patient with known vertebral metastases—this is a dangerous assumption that can delay diagnosis of cord compression
• Do not order plain radiographs or CT as initial imaging—these are insensitive for epidural disease and cord compression 9
• Do not wait for neurological symptoms to develop before imaging—by then, damage may be irreversible
• Do not delay dexamethasone if high clinical suspicion exists, even before imaging confirmation 2, 4

Definitive Treatment Planning

Once imaging is complete:

For spinal cord compression:

• Surgery followed by radiotherapy for single-level compression in good performance status patients 2, 4
• Radiotherapy alone (single 8 Gy fraction or hypofractionated regimen) for poor surgical candidates 2, 4

For uncomplicated painful metastases:

• Single-fraction external beam radiotherapy (8 Gy) is equally effective as fractionated regimens and more convenient 1, 4
• Stereotactic body radiotherapy may provide superior pain control at 3-6 months compared to conventional radiotherapy 10, 11

Systemic bone-targeted therapy:

• Denosumab is superior to zoledronic acid, extending time to first skeletal-related event by median 8.2 months 8
• Both agents should be continued as long as bone metastases persist 5
• Ensure calcium and vitamin D supplementation and dental evaluation before starting 2, 5