Objective Thoracoscopic Criteria in Differentiation between Benign and Malignant Pleural Effusions

Area of Science:

• Thoracic Surgery
• Pulmonology
• Diagnostic Imaging

Background:

• Thoracoscopy is the gold standard for diagnosing pleural malignancy.
• Macroscopic findings like nodules and thickening are key indicators.
• Objective criteria are needed to differentiate benign from malignant pleural diseases.

Purpose of the Study:

• To define objective macroscopic criteria for differentiating benign from malignant pleural diseases.
• To explore the anatomical predilection of pleural abnormalities.
• To assess the diagnostic value of macroscopic findings during thoracoscopy.

Main Methods:

• Structured review of video footage from 96 medical thoracoscopy procedures.
• Two independent assessors scored abnormalities using objective criteria.
• Abnormalities (nodules, inflammation) were assessed on costoparietal, visceral, and diaphragmatic surfaces.

Main Results:

• Inflammation was predominant in benign cases (65% costoparietal), while nodules were predominant in malignant cases (73% costoparietal).
• Nodules were found in 24% of benign diagnoses, particularly on costoparietal surfaces.
• Malignant nodules showed a predilection for the middle and inferior lateral costoparietal pleura.

Conclusions:

• Macroscopic nodules in malignant pleural effusion predominantly affect specific costoparietal areas.
• While nodules can occur in benign conditions, their presence in multiple costoparietal areas favors malignancy.
• Inflammation is the primary macroscopic finding in benign pleural effusion.