Treatment of Metastatic Extramammary Paget's Disease with Vertebral Involvement

Immediate Management of Vertebral Metastases

The American College of Radiology recommends immediate administration of dexamethasone at a minimum dose of 4 mg every 6 hours (16 mg/day) for spinal cord compression risk, with doses ranging from 10-100 mg depending on severity of spinal cord compression 1
Gradual reduction of dexamethasone over 2 weeks after definitive treatment is initiated 1
MRI of the entire spine with contrast (T1 and T2) is the gold standard and should be performed within 12 hours if epidural metastatic spinal cord compression (MESCC) is suspected 1
Assess for spinal instability, neurological deficits, and degree of cord compression to guide treatment selection 2, 3

Radiation therapy is the preferred treatment for symptomatic spinal metastases, providing pain relief in 50-58% of cases with complete pain disappearance in 30-35% 1
Hypofractionated regimens are the standard approach (single fraction 8 Gy or 5×4 Gy, 10×3 Gy for longer life expectancy) 1
Stereotactic body radiation therapy (SBRT) achieves local tumor control and pain relief >80% with faster relief compared to conventional radiation 4, 1
Surgery followed by radiation therapy is indicated only if life expectancy ≥3 months and specific criteria are met, including spinal instability requiring fixation 5, recurrence or progression after radiation therapy 1, and neurological deterioration during radiation and corticosteroids 1
Contraindications for surgery include paraplegia >24 hours and life expectancy <3 months 1

Zoledronic acid, denosumab, or pamidronate should be administered to delay skeletal-related events (SREs) in patients with bone metastases 1
Dental preventive measures are mandatory before initiation to prevent osteonecrosis of the jaw 1

Urgent multidisciplinary consultation including medical oncology, radiation oncology, and spinal surgery is required within 24 hours of MESCC diagnosis 1
A designated responsible physician should coordinate all aspects of care, with palliative care team involvement for symptom management 6

Delaying spinal imaging or radiation therapy can result in irreversible neurological damage; proactive management is essential 7, 8