A 65-year-old man is evaluated in the clinic after a routine preoperative chest radiograph for an elective inguinal hernia repair reveals a 15-mm solid nodule in the periphery of the right upper lung lobe. He has a 40-pack-year smoking history and quit 2 years ago. He reports no cough, hemoptysis, or weight loss. Vital signs are normal, and physical examination is unremarkable. Arrange the following diagnostic steps in the most appropriate sequential order for evaluating this patient's pulmonary nodule, from the immediate next step to the definitive diagnostic procedure.
- 1Obtain and review previous chest imaging
- 2Perform a noncontrast computed tomography (CT) scan of the chest
- 3Obtain an 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET) scan
- 4Perform an image-guided transthoracic core needle biopsy
Answer
The correct sequence of diagnostic steps is: 1) Obtain and review previous chest imaging, 2) Perform a noncontrast CT scan of the chest, 3) Obtain an FDG-PET scan, and 4) Perform an image-guided transthoracic core needle biopsy.
The diagnostic workup of a solitary pulmonary nodule follows a stepwise approach from least invasive to most invasive. The immediate first step is always to review any prior chest imaging to determine if the nodule is new or has been stable. Stability over 24 months strongly suggests a benign etiology. If prior images are unavailable or show growth, a noncontrast chest CT is required to fully characterize the nodule's anatomy. For solid nodules >8 mm that lack definitively benign calcification patterns, an FDG-PET scan is indicated to assess metabolic activity and the risk of malignancy. Finally, if the PET scan is positive, a tissue diagnosis via biopsy is indicated to confirm malignancy and guide treatment.
Step-by-Step Solution
Key Concept
The sequential diagnostic evaluation of a newly discovered solitary pulmonary nodule.
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