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Difficulty: MediumDiagnostic Workup and Test Sequencing

A 62-year-old man comes to the clinic to discuss the results of a recent imaging study. He recently participated in a corporate wellness program, which included a routine chest radiograph that revealed a 1.2-cm (12-mm) solitary nodule in the periphery of the right upper lobe. The patient has no cough, hemoptysis, weight loss, or night sweats. His past medical history is significant for hypertension and hyperlipidemia. He has a 35-pack-year smoking history but quit 5 years ago. Vital signs are within normal limits. Physical examination reveals clear breath sounds bilaterally and no cervical lymphadenopathy. No previous chest radiographs are available for comparison. Which of the following is the most appropriate next step in the diagnostic workup?

  1. Computed tomography scan of the chestAnswer
  2. B
    Positron emission tomography scan
  3. C
    CT-guided percutaneous needle biopsy
  4. D
    Reassurance and repeat chest radiograph in 6 months
  5. E
    Bronchoscopy with transbronchial biopsy

Answer

Computed tomography scan of the chest
In a patient with a newly discovered solitary pulmonary nodule on a chest radiograph, when no prior images are available for comparison, the most appropriate next step in the diagnostic sequence is a computed tomography (CT) scan of the chest. A plain radiograph lacks the resolution to accurately characterize the nodule. A chest CT details the nodule's exact size, borders, density, and calcification pattern, which are critical for risk-stratifying the lesion. Based on the CT findings, the physician can properly sequence subsequent steps, such as serial surveillance (for low-risk features), PET scan (for intermediate-risk features), or tissue biopsy/excision (for high-risk features).

Step-by-Step Solution

1
Identify the primary clinical problem from the vignette.
The patient has a newly discovered 1.2-cm solitary pulmonary nodule (SPN) on a screening chest radiograph.
Establishing the core problem directs the application of appropriate clinical guidelines.
2
Assess the patient's risk factors and available historical data.
The patient is older and has a 35-pack-year smoking history, placing him at elevated risk for malignancy. Importantly, there are no prior chest radiographs available for comparison.
Reviewing prior imaging is the best way to prove a nodule is stable and benign. In the absence of old films, the nodule must be considered new and potentially malignant.
3
Determine the proper sequence of the diagnostic workup for a new SPN.
The initial step is to obtain high-resolution anatomical data via a non-contrast computed tomography (CT) scan of the chest.
A CT scan provides essential details regarding nodule size, margins (e.g., spiculated vs. smooth), and calcification patterns, which dictates whether the next step should be surveillance, PET scan, or biopsy.

Key Concept

The initial step in the diagnostic workup of a newly discovered solitary pulmonary nodule on a chest radiograph, without prior images for comparison, is a non-contrast CT scan of the chest.
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Topics

Diagnostic Workup and Test Sequencing

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