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Difficulty: MediumDiagnostic Workup and Test Sequencing

An occupational health evaluation for a 62-year-old shipyard worker includes a routine posterior-anterior chest radiograph. He has a 35-pack-year smoking history but currently reports no cough, dyspnea, hemoptysis, or unintentional weight loss. Vital signs are within normal limits, and physical examination of the chest reveals clear breath sounds bilaterally. The radiograph demonstrates a 1.6-cm, non-calcified, solid peripheral nodule in the right upper lobe. Review of the patient's medical records reveals a chest radiograph from three years ago that was entirely normal, confirming this is a newly developed lesion. Which of the following is the most appropriate next step in the diagnostic workup?

  1. A
    Fluorodeoxyglucose-positron emission tomography (PET) scan
  2. B
    Transthoracic image-guided needle biopsy
  3. Computed tomography of the chest without intravenous contrastAnswer
  4. D
    Flexible bronchoscopy with bronchoalveolar lavage
  5. E
    Reassurance and repeat chest radiograph in 3 months

Answer

Computed tomography of the chest without intravenous contrast
The most appropriate next step in the workup of a newly discovered solitary pulmonary nodule on a chest radiograph is a non-contrast computed tomography (CT) of the chest. Since prior imaging has already been reviewed to confirm the nodule is new, a CT scan is necessary to accurately characterize the lesion's margins, exact size, and calcification pattern, which will guide subsequent management such as biopsy, PET scan, or surveillance.

Step-by-Step Solution

1
Analyze the patient's risk factors and initial presentation.
The patient is a 62-year-old with a 35-pack-year smoking history, placing him at high risk for lung malignancy.
Establishing baseline risk determines the aggressiveness of the diagnostic workup.
2
Evaluate the radiographic findings and historical context.
A 1.6-cm solid pulmonary nodule is identified, and comparison with old records confirms it is a newly developed lesion.
Comparing with prior imaging is the most critical first step; since this has been done, the nodule is confirmed as new and requires active investigation.
3
Determine the next best diagnostic modality.
A non-contrast computed tomography (CT) of the chest is indicated.
A CT scan provides detailed cross-sectional visualization to characterize the nodule's margins, density, and potential calcifications, which dictates subsequent management.

Key Concept

The initial diagnostic step for a newly discovered solitary pulmonary nodule, after comparing with previous imaging, is a non-contrast CT scan of the chest to properly characterize the lesion's size, margins, and density.
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Diagnostic Workup and Test Sequencing

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