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Small (2-cm) Subpleural Pulmonary Lesions: Short- versus Long-Needle-Path CT-guided Biopsy—Comparison of Diagnostic Yields and Complications¹

¹ From the Departments of Diagnostic Radiology (S.G., F.A.M., M.J.W., K.A., D.C.M., R.M., M.E.H.), Pathology (S.K.), and Biostatistics (L.D.B.), University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Blvd, Box 325, Houston, TX 77030. From the 2003 RSNA Annual Meeting. Received September 3, 2003; revision requested November 20; final revision received April 5, 2004; accepted April 28. Address correspondence to S.G. (e-mail: sgupta@di.mdacc.tmc.edu).

PURPOSE: To retrospectively compare the diagnostic yield and complications associated with the use of short versus long needle paths for computed tomography (CT)-guided biopsy of small subpleural lung lesions.

MATERIALS AND METHODS: The study was approved by the institutional review board, and the requirement for informed patient consent was waived. The medical and imaging records of patients who underwent CT-guided biopsy of subpleural pulmonary nodules measuring up to 2 cm in diameter were reviewed. The study included 176 patients (79 men, 97 women; age range, 18–84 years) who were divided into two groups: In group A, a direct approach in which the needle traversed a short lung segment was used. In group B, an indirect approach involving the use of a longer needle path was used. Diagnostic yield, accuracy, and pneumothorax and chest tube placement rates were compared between the two groups. Two-tailed t tests and Pearson ² tests were used to analyze continuous and categorized variables, respectively.

RESULTS: Group A comprised 48 patients; and group B, 128 patients. The mean needle path length was 0.4 cm in group A and 5.6 cm in group B. The short-path approach necessitated more needle punctures (mean, 2.9 vs 1.8 with long-path approach, P < .001) through the pleura. The diagnostic yield in group A was significantly lower than that in group B (71% vs 94%, P < .001), particularly in patients with small (0–1-cm) nodules (40% in group A vs 94% in group B, P < .001). The frequency of postbiopsy pneumothorax was identical (69%) in the two groups. However, more group B than group A patients required chest tube placement for treatment of pneumothorax (38% vs 17%, P = .006).

CONCLUSION: Use of long-needle-path biopsy of subpleural lesions resulted in a higher diagnostic yield, especially for small nodules. However, compared with the short-needle-path technique, this approach was associated with a higher frequency of chest tube placement for pneumothorax.

© RSNA, 2005

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