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Difficulty: HardNeurosurgery

A 62-year-old female with a history of hormone receptor-positive breast cancer treated with a mastectomy four years ago visits an outpatient clinic due to progressively worsening mid-back pain over the past three weeks. The pain is localized to the thoracic region and worsens when she coughs or lies flat. Over the last 48 hours, she has noticed increasing heaviness in both legs and had an episode of urinary incontinence earlier today. Her temperature is 37.0°C (98.6°F), blood pressure is 138/86 mmHg, and heart rate is 82/min. Neurologic examination reveals 3/5 muscle strength in the bilateral lower extremities. Deep tendon reflexes are 3+ at the patellae and ankles, and bilateral plantar reflexes are extensor. Pinprick sensation is diminished below the level of the umbilicus. Which of the following is the most appropriate initial step in management?

  1. Administration of intravenous dexamethasoneAnswer
  2. B
    Urgent magnetic resonance imaging of the entire spine
  3. C
    Emergent decompressive laminectomy
  4. D
    Administration of broad-spectrum intravenous antibiotics
  5. E
    Lumbar puncture for cerebrospinal fluid analysis

Answer

Administration of intravenous dexamethasone should be performed immediately prior to any diagnostic testing.
This patient's progressive thoracic back pain (worse when lying flat), bilateral lower extremity weakness, upper motor neuron signs, and bowel/bladder dysfunction in the setting of a known malignancy strongly indicate malignant epidural spinal cord compression (MESCC). The most critical initial step in the management of MESCC with evolving neurologic deficits is the immediate administration of high-dose intravenous glucocorticoids (e.g., dexamethasone). Glucocorticoids rapidly reduce the vasogenic edema associated with the tumor mass, alleviating pressure on the spinal cord and preventing permanent ischemic injury. This intervention must be performed empirically and should never be delayed for diagnostic testing.

Step-by-Step Solution

1
Analyze the patient's clinical presentation and history.
The patient has progressive back pain, bilateral lower extremity weakness, a sensory level at T10, and upper motor neuron signs (hyperreflexia, extensor plantars) with a known history of breast cancer.
These findings are highly suspicious for malignant epidural spinal cord compression (MESCC).
2
Identify the urgency of the neurologic deficits.
The acute onset of motor weakness and urinary incontinence indicates impending irreversible spinal cord injury.
Rapid intervention is required to preserve neurologic function.
3
Determine the optimal sequence of management.
Intravenous glucocorticoids (dexamethasone) are given first, followed by an urgent MRI of the spine.
Corticosteroids rapidly reduce vasogenic edema surrounding the metastasis, temporarily relieving cord pressure and preserving function while awaiting diagnostic imaging and definitive surgical or radiation treatment.

Key Concept

In patients with suspected malignant epidural spinal cord compression presenting with neurologic deficits, high-dose intravenous glucocorticoids must be administered immediately before obtaining confirmatory imaging.
Estimated Time:1m 30s
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Neurosurgery

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