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Question

Difficulty: MediumOrdering Imaging Studies

Match each patient presentation of back pain with the single most appropriate initial step in radiological evaluation.

  • A 34-year-old software developer complains of sharp lumbar pain shooting down his right thigh that started yesterday while moving furniture. Neurologic examination reveals normal reflexes, preserved strength, and no saddle anesthesia.Defer radiological assessment and begin symptomatic management
  • A 66-year-old postmenopausal woman treated for ductal carcinoma three years ago reports a persistent, dull ache in her upper back that frequently wakes her from sleep and is unresponsive to oral analgesics.Detailed spinal neuroimaging with and without intravenous gadolinium
  • A 41-year-old architect describes a one-year history of chronic lumbosacral discomfort that is most severe upon awakening and gradually improves after taking a morning walk.Standard plain films targeting the sacroiliac articulations
  • A 73-year-old gentleman with poorly controlled hypertension suddenly develops agonizing interscapular pain; physical examination reveals a noticeable pulse deficit between the radial arteries.Cross-sectional imaging of the arterial vasculature with intravenous contrast

Answer

The correct pairings align the software developer with deferring imaging (no red flags), the breast cancer survivor with spinal neuroimaging (high risk for metastasis), the architect with plain films (suspected inflammatory arthropathy), and the hypertensive gentleman with rapid cross-sectional arterial imaging (suspected aortic dissection).
The correct pairings rely on appropriately risk-stratifying patients based on their clinical presentation. Uncomplicated mechanical radiculopathy warrants a trial of conservative therapy without immediate imaging. A history of cancer with night pain mandates highly sensitive neuroimaging to evaluate for metastasis. Inflammatory back pain with morning stiffness is initially investigated via plain films of the affected joints. Finally, a suspected vascular emergency presenting as back pain requires immediate, contrast-enhanced arterial visualization.

Step-by-Step Solution

1
Evaluate the 34-year-old developer's presentation for red flag symptoms.
No red flags are present for this acute radiculopathy.
In the absence of severe neurologic deficits or trauma, mechanical back pain is managed conservatively without initial imaging to avoid unnecessary radiation and costs.
2
Analyze the 66-year-old woman's history of malignancy and nocturnal pain.
These are classic red flags for spinal metastasis.
Prompt evaluation with gadolinium-enhanced neuroimaging is required to assess for epidural spinal cord compression.
3
Assess the 41-year-old architect's chronic pain that improves with activity.
The clinical pattern strongly suggests ankylosing spondylitis.
Initial evaluation for suspected sacroiliitis begins with standard plain films.
4
Identify the critical nature of the 73-year-old gentleman's tearing interscapular pain and pulse deficit.
The presentation is highly suspicious for acute aortic dissection.
Immediate visualization of the aorta using cross-sectional imaging with intravenous contrast is critical for surgical triage.

Key Concept

Evidence-based guidelines for ordering imaging studies in the evaluation of back pain depend heavily on identifying 'red flag' symptoms and distinguishing between mechanical, inflammatory, oncologic, and vascular etiologies.
Estimated Time:1m 30s
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Ordering Imaging Studies

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