FDG PET/CT Staging of Non-Small Cell Lung Cancer
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Question
A patient with a 3 cm right upper lobe lung mass (biopsy-proven adenocarcinoma) undergoes FDG PET/CT for staging. The scan reveals unexpected FDG-avid contralateral mediastinal lymph nodes and a right adrenal FDG-avid lesion. How does this PET/CT result affect staging and management?
- ANo change — PET/CT does not affect NSCLC management
- BThe patient should proceed to immediate surgical resection
- CThe adrenal lesion alone changes staging but not treatment
- DPET/CT upstages the patient from potentially resectable (stage II) to likely unresectable (stage IIIB/IV), avoiding futile surgery and redirecting to systemic therapy
Show the answer and explanation
D. PET/CT upstages the patient from potentially resectable (stage II) to likely unresectable (stage IIIB/IV), avoiding futile surgery and redirecting to systemic therapy
FDG PET/CT dramatically impacts NSCLC staging management. Contralateral mediastinal nodal involvement (N3) and adrenal metastasis (M1b) found on PET upstages a patient from potentially resectable early/locally advanced disease to unresectable stage IIIB-IV. This avoids futile thoracic surgery and redirects treatment to appropriate systemic therapy (immunotherapy, chemotherapy, targeted therapy based on molecular markers). PET/CT upstages approximately 20–30% and downstages approximately 5% of NSCLC patients compared to CT alone. Per guidelines, FDG PET/CT is standard of care for NSCLC staging before planned curative-intent surgery.
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