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Case Reports
. 2015 Feb 13:8:445-9.
doi: 10.2147/OTT.S68819. eCollection 2015.

The imaging features of metanephric adenoma: a case report and review of literature

Yu-Chuan Hu  1 , Lang Wu  2 , Lin-Feng Yan  1 , Wei Zhang  3 , Guang-Bin Cui  1
Affiliations
Case Reports

The imaging features of metanephric adenoma: a case report and review of literature

Yu-Chuan Hu et al. Onco Targets Ther. .

Abstract

Metanephric adenoma (MA) is a rare epithelial tumor of the kidney with a characteristic histology. To date, the imaging features of the tumor have not been clearly described. Until now, MA was considered to be benign, but the majority of MA cases underwent nephrectomy. Here, we report a case of MA confirmed by surgical pathology, and we will analyze the ultrasound and computed tomography findings. The radiological features of MA are presented along with a brief review of the pertinent literature to deepen the understanding of MA's imaging features.

Keywords: X-ray computed tomography; histology; metanephric adenoma; ultrasound.

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Figures

Figure 1
Figure 1
Longitudinal sonogram of the left kidney. Notes: Longitudinal sonogram shows a 3.2 cm ×4.5 cm liquid dark area (C) in the lower pole of the left kidney (LK). An irregular 2.4 cm ×2.1 cm, slightly hyperechoic mass (N) is visible in the liquid dark area without acoustical shadowing, which was extensively connected to the left kidney.
Figure 2
Figure 2
CT images of the left renal tumor. Notes: (A) Unenhanced CT scan shows a well-defined, high-density mass measuring 3.7 cm ×3.3 cm (long arrow) in the lower pole of the left kidney, with an irregularly shaped lower attenuation area (short arrow) in the mass. (B–D) Enhanced CT scan shows that the tumor appears to have no enhancement in the peripheral portion (white arrow), and progressive enhancement in the central portion (black arrow). Abbreviation: CT, computed tomography.
Figure 3
Figure 3
Microscopic appearance of MA. Notes: (A) A histological specimen shows the homogeneous round or ovoid tumor cells mainly composed of tiny tubules and papillae, accompanied by very scanty stroma (HE ×200); (B and C) the tumor cells are negative for WT1 and CD57 (SP ×200), respectively. Abbreviations: MA, metanephric adenoma; HE, hematoxylin and eosin; SP, streptavidin-peroxidase.
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