Angiomyolipoma being surgically excised for presumed kidney carcinoma

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• 作者：Weibin Hou ; He Xiao ; Guanghua Liu ; Zhigang Ji
• 关键词：Angiomyolipoma ; Renal cell carcinoma ; Angiomyolipoma with minimal fat
• 刊名：International Urology and Nephrology
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：47
• 期：7
• 页码：1037-1043
• 全文大小：555 KB
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• 作者单位：Weibin Hou (1)
  He Xiao (1)
  Guanghua Liu (1)
  Zhigang Ji (1)
  
  1. Department of Urology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 1#, Shuaifuyuan, Dongcheng District, Beijing, 100730, People’s Republic of China
  
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Nephrology
  Urology and Andrology
  
• 出版者：Springer Netherlands
• ISSN：1573-2584

文摘

Objective To explore the important factors involved in angiomyolipoma (AML) being preoperatively misclassified and surgically removed for presumed kidney carcinoma. Materials and methods From 2008 to 2014, AML was pathologically confirmed in 38 patients who underwent radical or partial nephrectomy for presumed malignant renal tumor. Control group 1 were patients with renal cell carcinoma (RCC) matched for age and tumor size; control group 2 were patients with typical AML matched for age and sex. Pertinent data of the studied group and its matched control groups were recorded and analyzed. Results The mean age of the patients in study group was 48.11?±?12.92?years, and the mean tumor size was 3.12?±?1.68?cm (range 0.9-.4). More than 84?% of the misclassified AMLs measured ??cm, and over 21?% patients underwent radical nephrectomy. The only statistically significant feature between the misdiagnosed AML group and the matched RCC group is mean age (48.11?±?12.92 vs. 56.92?±?10.28, P?=?0.002). Compared with the matched typical AML group, the misdiagnosed AML group has smaller mean tumor size (3.12?±?1.68 vs. 5.85?±?3.33, P?<?0.001), but more patients undergoing radical nephrectomy (21.05 vs. 0?%, P?=?0.003). Two main imaging features, which are hypoechoic on ultrasonography and fat density on computed tomography (CT), were statistically different between the two groups. The misdiagnosis of AML was significantly associated with no fat density on CT (OR 5.528, P?=?0.004) and hypoechoic on ultrasonography (OR 3.845, P?=?0.017). Conclusions A number of AMLs were misdiagnosed as RCCs, causing a large number of unnecessary surgeries. No fat density on CT and no hyperechoic on ultrasonography resulting from small tumor size were the two most important factors causing AML being excised for presumed kidney carcinoma. Ultrasonography and CT cannot differentiate atypical AML from kidney carcinoma effectively, so improved renal biopsy and noninvasive biomarkers are urgently warranted to prevent us from excising benign renal tumor aggressively.