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Journal of Korean Society of Ultrasound in Medicine 2003 ; 22 (3) : p.119-123
Differentiation between Small (≤3 cm) Renal Cell Carcinoma and Angiomyolipoma According to Vascular Distribution
Kun young Lim, M.D. Min Hoan Moon, M.D.*, Hyo Chul Kim, M.D., Seung Hyup Kim, M.D.
Department of Radiology, Seoul National University College of Medicine, Institute of Radiation Medicine, SNUMRC *Department of Radiology, Sungkyunkwan University school of Medicine, Samsung Cheil Hospital
PURPOSE : To evaluate the usefulness of color/power Doppler ultrasonography (US) in differentiation between small renal cell carcinomas (RCCs) and angiomyolipomas based on the vascular distribution on color/power Doppler ultrasonography. MATERIALS and METHODS : Retrospective analysis of color/power Doppler US findings of twenty patients with small renal tumors less than 3 cm in size and twenty patients with angiomyolipoma was done. The vascular distribution on color/power Doppler US was classified into: pattern 1=no flow signal, pattern 2=intratumoral focal flow signal, pattern 3=penetrating flow signal and pattern 4=peripheral flow signal. Statistical analysis was done using Fisher’s Exact Test, at 99% confidence level. RESULTS : Among 20 patients with RCCs, 13 patients had pattern 3 or pattern 4 whereas among 20 patients with angiomyolipoma, 17 patients, pattern 1 or 2. There was a statistically significant difference in the vascular distribution between two groups (p<0.01). CONCLUSION : Color/power Doppler ultrasonography showed a distinct difference in vascular distributions for renal cell carcinomas and angiomyolipomas with a statistical significance. Therefore, color/power Doppler US is useful in differentiating renal cell carcinomas from angiomyolipomas.
Keyword : Kidney Kidney neoplasms, US Ultrasound (US), Doppler studies Kidney neoplasms, diagnosis
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