Published in:
Open Access
01-12-2015 | Case Report
Fat-poor angiomyolipoma with cyst-like changes mimicking a cystic renal cell carcinoma: a case report
Authors:
Yuki Kobari, Toshio Takagi, Tsunenori Kondo, Hidekazu Tachibana, Shoichi Iida, Yu Nishina, Kenji Omae, Satoru Morita, Tomoko Yamamoto, Junpei Iizuka, Yoji Nagashima, Kazunari Tanabe
Published in:
World Journal of Surgical Oncology
|
Issue 1/2015
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Abstract
Angiomyolipoma is a common benign renal tumor. It is typically composed of adipose tissue and hence is easily diagnosed by using imaging methods such as ultrasonography, computed tomography, and magnetic resonance imaging. However, it is difficult to differentiate an atypical angiomyolipoma such as a fat-poor angiomyolipoma from a malignant tumor by using these imaging methods. We report a case of a fat-poor angiomyolipoma with cyst-like changes in a 35-year-old man. The angiomyolipoma was initially suspected to be a cystic renal cell carcinoma according to preoperative imaging studies. A 5-cm cystic tumor with an enhanced septal wall and exophytic formation was present in the middle section of the left kidney. The patient underwent partial nephrectomy. Pathological findings showed necrosis and hematoma in almost the entire lesion, with a small amount of adipose and muscle tissue. Finally, a fat-poor angiomyolipoma was diagnosed.