Mediastinal transthoracic needle and core lymph node biopsy: should it replace mediastinoscopy?

Area of Science:

• Thoracic oncology
• Diagnostic imaging
• Interventional pulmonology

Background:

• Mediastinal lymph node assessment is crucial for lung cancer staging.
• Transthoracic needle biopsy (FNA) and core biopsy are minimally invasive techniques.
• Mediastinoscopy is an established but more invasive method for mediastinal staging.

Purpose of the Study:

• To evaluate the diagnostic yield of transthoracic needle biopsy (FNA) with or without core biopsy for mediastinal lymph nodes.
• To determine if FNA/core biopsy should precede mediastinoscopy in lung cancer staging.
• To assess the accessibility of various mediastinal nodal stations via CT-guided biopsy.

Main Methods:

• Retrospective study of 89 patients with mediastinal lymphadenopathy (>1.5 cm by CT).
• Mediastinal transthoracic FNA, with or without core biopsy, performed prior to mediastinoscopy.
• Analysis of diagnostic success rates and complications, including novel lung-protective techniques.

Main Results:

• Transthoracic FNA with or without core biopsy yielded a diagnosis in 77.5% (69/89) of patients.
• The technique was successful in accessing various nodal stations, including those difficult to reach.
• Lung-protective techniques reduced pneumothorax rates compared to standard lung traversal.

Conclusions:

• Transthoracic FNA with or without core biopsy is highly effective for diagnosing mediastinal adenopathy or masses.
• This biopsy technique should be the initial diagnostic step before mediastinoscopy for lung cancer staging.
• The procedure offers a high diagnostic yield and can access most mediastinal nodal stations.