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Article Abstract
Purpose: To evaluate the diagnostic yield of percutaneous renal mass biopsy (RMB) before and after ablation.
Materials And Methods: In total, 333 renal masses in 332 consecutive patients underwent computed tomography (CT)-guided biopsies and were included in this study. All biopsies were performed with 18-gauge core needles with CT fluoroscopic guidance before ablation (n = 234) or immediately after radiofrequency ablation (RFA) (n = 40) or cryoablation (CA) (n = 59). The safety and diagnostic yield of RMB were evaluated. Both univariate and multivariate analyses were used to identify factors affecting diagnostic yield.
Results: No major complication occurred. The 281 specimens (84%) were diagnostic. There were 257 renal cell carcinomas (77%), 21 benign masses (6%), and 3 metastases (1%). The remaining 52 specimens (16%) were nondiagnostic. The diagnostic yields before ablation, after RFA, and CA were 91% (212/234), 80% (32/40), and 63% (37/59), respectively. Small masses (P = 0.050 and 0.006), cystic masses (P < 0.001 and < 0.001), and post-CA (P < 0.001 and < 0.001) were independent and significant factors affecting the nondiagnostic results in both univariate and multivariate analyses.
Conclusion: CT-guided RMB can be nondiagnostic when the tumor is small, cystic, or biopsied immediately after CA.
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