title: Metanephric adenoma: A report of two cases and review of the literature.
abstract: Metanephric adenoma (MA) is a rare benign renal neoplasm of originating in the epithelial cells, which is often difficult to distinguish from malignant neoplasms preoperatively. In this study we present two cases of patients with MA with the aim to analyze the clinical manifestations, imaging, pathology, diagnosis and treatment of MA. Computed tomography (CT) of the first case revealed a solid well-demarcated tumor, 5.5 × 5.4 cm in diameter. Ultrasound examination of the second patient revealed a hypoechoic mass with solid aspect and irregular limits in the upper pole of the right kidney. CT confirmed the presence of a 4 cm expansive tumoral formation with intermediate attenuation and minimum venous contrast enhancement at that anatomic site. The two cases underwent surgery and the patients were free from recurrence after a follow-up period of 18 months to 2 years. We also present a supplementary review of previously published cases and related literature.
authors.affiliation: Department of Urology, Peking University Shenzhen Hospital; ; The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong 518036;
authors.forename: Yongqing
authors.initials: Y
authors.lastname: Lai
authors.affiliation: Department of Urology, Peking University Shenzhen Hospital; ; The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong 518036; ; Anhui Medical University, Hefei, Anhui 230032;
authors.forename: Duqun
authors.initials: D
authors.lastname: Chen
authors.affiliation: Department of Urology, Peking University Shenzhen Hospital; ; The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong 518036; ; Shantou University Medical College, Shantou, Guangdong 515041;
authors.forename: Xiaonan
authors.initials: X
authors.lastname: Xu
authors.affiliation: Department of Urology, Peking University Shenzhen Hospital; ; The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong 518036;
authors.forename: Zuhu
authors.initials: Z
authors.lastname: Yu
authors.affiliation: Department of Urology, Peking University Shenzhen Hospital; ; The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong 518036;
authors.forename: Liangchao
authors.initials: L
authors.lastname: Ni
authors.affiliation: Department of Urology, Peking University Shenzhen Hospital; ; The Guangdong and Shenzhen Key Laboratory of Male Reproductive Medicine and Genetics, Institute of Urology, Peking University Shenzhen Hospital, Shenzhen PKU-HKUST Medical Center, Shenzhen, Guangdong 518036;
authors.forename: Shangqi
authors.initials: S
authors.lastname: Yang
authors.affiliation: Department of Ultrasound Division, Peking University Shenzhen Hospital, Shenzhen, Guangdong 518036, P.R. China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Chen
keywords: case report; metanephric adenoma