Sensitivity, specificity, and predictive values of closed pleural biopsy.

Pleural effusions present a diagnostic challenge in community hospitals. While imaging and fluid analysis offer initial insights, they often fail to confirm malignancy or tuberculosis. Prior research has shown that nonspecific biopsy results are common in such cases. That uncertainty drives the need to evaluate the diagnostic accuracy of closed pleural biopsy. No prior work had resolved the sensitivity and specificity of this method in real-world settings. This gap motivated the current analysis of biopsy outcomes over a six-year period. The goal is to clarify the role of the procedure in community settings. Understanding its limitations is essential for guiding further testing. This study contributes by quantifying diagnostic performance in a large patient cohort.

The aim was to assess the diagnostic accuracy of closed pleural biopsy in patients with pleural effusions. The focus was on two conditions: malignant neoplasm and tuberculosis. The researchers wanted to determine how often the procedure correctly identified or ruled out these diseases. They also aimed to evaluate the impact of nonspecific results on clinical outcomes. The study was conducted in three community hospitals to reflect typical clinical environments. A six-year follow-up period was used to confirm final diagnoses. The goal was to provide actionable data for clinicians in similar settings. This approach allows for a realistic evaluation of the procedure's utility.

The study used a retrospective design, analyzing records from three community hospitals. All patients who underwent closed pleural biopsy for pleural effusion were included. The time frame covered six years of clinical records. Biopsy results were compared with final clinical and pathologic outcomes. Follow-up periods ranged from 12 to 72 months. Adequate tissue was defined as sufficient for a definitive diagnosis. The researchers categorized results as malignant, granulomatous, or nonspecific. Statistical measures included sensitivity, specificity, and predictive values.

The procedure yielded a diagnostic result for malignant neoplasm in 54 patients and for granulomatous disease in ten. A nonspecific or normal result was found in 143 patients, or 68% of the total. Of these, 30 were eventually diagnosed with either malignancy or tuberculosis. In 101 cases, these conditions were excluded. Twelve patients remained undiagnosed after follow-up. Sensitivity was 65% for malignant neoplasm and 90% for tuberculosis. One false-positive result was reported in a patient with nontuberculous granulomatous pleuritis. Specificity and positive predictive value were 99% and 98%, respectively. Negative predictive value was 77%.

The study shows that closed pleural biopsy has high specificity and positive predictive value for malignant neoplasm and tuberculosis. However, a nonspecific result does not rule out malignancy. The procedure is valuable in community hospital settings but has limitations in diagnostic sensitivity. The authors suggest that further testing is necessary when results are nonspecific. These findings align with the observed 68% rate of nonspecific outcomes. The researchers emphasize the importance of follow-up in such cases. The negative predictive value of 77% indicates that some cases may require additional investigation. The results support the use of the procedure but highlight the need for caution in interpreting nonspecific findings.