title: Imaging findings of common benign renal tumors in the era of small renal masses: differential diagnosis from small renal cell carcinoma: current status and future perspectives.
abstract: The prevalence of small renal masses (SRM) has risen, paralleling the increased usage of cross-sectional imaging. A large proportion of these SRMs are not malignant, and do not require invasive treatment such as nephrectomy. Therefore, differentiation between early renal cell carcinoma (RCC) and benign SRM is critical to achieve proper management. This article reviews the radiological features of benign SRMs, with focus on two of the most common benign entities, angiomyolipoma and oncocytoma, in terms of their common imaging findings and differential features from RCC. Furthermore, the role of percutaneous biopsy is discussed as imaging is yet imperfect, therefore necessitating biopsy in certain circumstances to confirm the benignity of SRMs.
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.
authors.forename: Sungmin
authors.initials: S
authors.lastname: Woo
authors.affiliation: Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea. ; Institute of Radiation Medicine and Kidney Research Institute, Seoul National University Medical Research Center, Seoul 110-744, Korea.
authors.forename: Jeong Yeon
authors.initials: JY
authors.lastname: Cho
mesh_terms: D050153:Abdominal Fat / Q000473:pathology; D018249:Adenoma, Oxyphilic / Q000175:diagnosis / Q000000981:diagnostic imaging; D018207:Angiomyolipoma / Q000175:diagnosis / Q000000981:diagnostic imaging; D002292:Carcinoma, Renal Cell / Q000175:diagnosis* / Q000000981:diagnostic imaging; D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging*; D007889:Leiomyoma / Q000175:diagnosis / Q000000981:diagnostic imaging; D011859:Radiography; D014463:Ultrasonography
keywords: Angiomyolipoma; Oncocytoma; Renal cell carcinoma; Small renal mass