Small (<4 cm) clear cell renal cell carcinoma: correlation between CT findings and histologic grade

Soo Yeon Choi, Deuk Jae Sung, Kyung Sook Yang, Kyeong Ah Kim, Suk Keu Yeom, Ki Choon Sim, Na Yeon Han, Beomjin Park, Min Ju Kim, Sung Bum Cho, Jeong Hyeon Lee

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Abstract

Purpose: To evaluate the correlation between CT findings and histologic grade of small clear cell renal cell carcinoma (ccRCC). Methods: CT scans of 101 patients with small ccRCC were reviewed independently by two radiologists for tumor size, shape, margin, encapsulation, enhancement pattern, and visual relative enhancement. Enhancement patterns were defined according to the percentage of uniform enhancement [pattern 1, homogeneous (≥90%); pattern 2, relatively homogeneous (≥75 and <90%); and pattern 3, heterogeneous (<75%)]. Quantitative parameters representing attenuation and degree of enhancement were calculated. Histologic grade was classified as low (Fuhrman grade I or II) and high (Fuhrman grade III or IV). CT imaging variables were analyzed using univariate and multivariate analyses. Results: A total of 63 low-grade and 38 high-grade small ccRCCs were assessed. Low-grade tumors differed from high-grade tumors with respect to enhancement pattern 1 or 2 (p < 0.001 and p < 0.001), smaller size (p = 0.002 and p = 0.001), and lower attenuation on unenhanced scan (p < 0.001 and p = 0.008). In multivariate analysis, enhancement pattern 1 or 2 and low attenuation (≤30 HU) were identified as independent predictors of low-grade ccRCC. Accuracy derived from logistic regression analysis was 79.2% for reader 1 and 70.3% for reader 2. Conclusions: CT imaging features including tumor attenuation and enhancement pattern can be useful to predict the biologic behavior of small ccRCC for adequate treatment strategy.

Original languageEnglish
Pages (from-to)1160-1169
Number of pages10
JournalAbdominal Radiology
Volume41
Issue number6
DOIs
Publication statusPublished - 2016 Jun 1

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Keywords

  • Carcinoma, renal cell
  • Clear cell renal cell carcinoma
  • Contrast media
  • Kidney neoplasms
  • Multidetector computed tomography

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Gastroenterology
  • Urology

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