Journal of Korean Society of Medical Ultrasound 2003;22(3): 119-123.
Differentiation between Small (< or =3 cm) Renal Cell Carcinoma and Angiomyolipoma According to Vascular Distribution.
Kun young Lim, Min Hoan Moon, Hyo Chul Kim, Seung Hyup Kim
1Department of Radiology, Seoul National University College of Medicine, Korea.
2Institute of Radiation Medicine, SNUMRC, Korea.
3Department of Radiology, Sungkyunkwan University school of Medicine, Samsung Cheil Hospital, Korea.
  Published online: September 1, 2003.
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.
Keywords: Kidney; Kidney neoplasms, US; Ultrasound (US), Doppler studies; Kidney neoplasms, diagnosis
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