If a PET scan in the mediastinum is positive, which procedures are considered for confirmation?

If a PET scan in the mediastinum is positive, which procedures are considered for confirmation?

• A. Mediastinoscopy or EBUS
• B. CT-guided biopsy
• C. Pleural biopsy
• D. Bronchoscopy

Answer: (A)

When a PET scan shows uptake in the mediastinum, you need tissue confirmation to distinguish cancer from infection or inflammation and to accurately stage disease for treatment planning. The best ways to obtain mediastinal tissue are mediastinoscopy or endobronchial ultrasound-guided sampling. Mediastinoscopy is a surgical approach that provides direct access to upper mediastinal lymph nodes and allows biopsy of multiple nodal stations with a high diagnostic yield, though it requires anesthesia and a short hospital stay. Endobronchial ultrasound-guided biopsy (EBUS-TBNA) uses a bronchoscope with ultrasound to visualize and sample nodes adjacent to the airways in a minimally invasive, outpatient procedure with a high yield for malignant mediastinal and hilar nodes. CT-guided biopsy is typically reserved for peripheral lung lesions or masses near the chest wall and is less suitable for mediastinal lymph nodes due to location and risk profiles. Pleural biopsy targets the pleural surfaces, not mediastinal nodes, and bronchoscopy alone may miss nodes that are not accessible via the airway. Therefore, sampling the mediastinal nodes with mediastinoscopy or EBUS is the appropriate confirmation approach.

When a PET scan shows uptake in the mediastinum, you need tissue confirmation to distinguish cancer from infection or inflammation and to accurately stage disease for treatment planning. The best ways to obtain mediastinal tissue are mediastinoscopy or endobronchial ultrasound-guided sampling.

Mediastinoscopy is a surgical approach that provides direct access to upper mediastinal lymph nodes and allows biopsy of multiple nodal stations with a high diagnostic yield, though it requires anesthesia and a short hospital stay. Endobronchial ultrasound-guided biopsy (EBUS-TBNA) uses a bronchoscope with ultrasound to visualize and sample nodes adjacent to the airways in a minimally invasive, outpatient procedure with a high yield for malignant mediastinal and hilar nodes.

CT-guided biopsy is typically reserved for peripheral lung lesions or masses near the chest wall and is less suitable for mediastinal lymph nodes due to location and risk profiles. Pleural biopsy targets the pleural surfaces, not mediastinal nodes, and bronchoscopy alone may miss nodes that are not accessible via the airway.

Therefore, sampling the mediastinal nodes with mediastinoscopy or EBUS is the appropriate confirmation approach.