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Benign Renal Neoplasms in Adults: Cross-Sectional Imaging Findings

Srinivasa R. Prasad1, Venkateswar R. Surabhi1, Christine O. Menias2, Abhijit A. Raut3 and Kedar N. Chintapalli1

1 Department of Radiology, University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Dr., San Antonio, TX 78229.
2 Department of Radiology, Mallinckrodt Institute of Radiology, St. Louis, MO.
3 Department of Radiology, King Edward Memorial Hospital, Mumbai, India.


Figure 1
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  		Fig. 1 —72-year-old man with hereditary oncocytosis syndrome. Coronal contrast-enhanced CT scan during nephrographic phase shows bilateral solid renal masses (arrows) that were characterized as oncocytomas on histopathology.

 

Figure 2
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  		Fig. 2A —64-year-old man with histologically proven oncocytoma. K = kidney. Axial fat-saturated, T2-weighted gradient-refocused echo image shows expansile, solid right renal mass (arrow) with hyperintense central scar (S).

 

Figure 3
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  		Fig. 2B —64-year-old man with histologically proven oncocytoma. K = kidney. Axial fat-saturated, gadolinium-enhanced T1-weighted 3D gradient-refocused echo image shows right kidney mass (arrow) with hypointense central scar (S).

 

Figure 4
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  		Fig. 3 —Contrast-enhanced axial CT scan in 60-year-old woman with hematuria shows hypoattenuating, expansile solid mass (arrows) in left kidney. Radical nephrectomy showed mass to be metanephric adenoma. K = kidney.

 

Figure 5
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  		Fig. 4 —43-year-old woman with hematuria. Transverse sonogram shows uniformly echogenic mass (arrows) in upper pole of left kidney (K) that was proven to be angiomyolipoma.

 

Figure 6
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  		Fig. 5 —58-year-old woman with angiomyolipoma of kidney. Sagittal contrast-enhanced CT scan shows exophytic renal mass (arrows) with foci of macroscopic fat (arrowhead).

 

Figure 7
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  		Fig. 6A —38-year-old woman with documented tuberous sclerosis complex and renal angiomyolipomas. Axial in-phase T1-weighted 2D gradient-refocused echo MR image shows bilateral multicentric renal masses that have increased signal intensity (arrows).

 

Figure 8
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  		Fig. 6B —38-year-old woman with documented tuberous sclerosis complex and renal angiomyolipomas. Axial fat-saturated T2-weighted 2D gradient-refocused echo MR image shows marked drop in signal intensity of masses (arrows).

 

Figure 9
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  		Fig. 7 —55-year-old woman who underwent partial nephrectomy for serendipitously detected renal mass. Axial contrast-enhanced CT scan shows exophytic soft-tissue mass (arrow). Histopathology showed lipid-poor angiomyolipoma.

 

Figure 10
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  		Fig. 8A —60-year-old man with hematuria and histologically proven hemangioma. Axial fat-saturated T2-weighted 2D gradient-refocused echo MR image shows hyperintense left kidney mass in renal sinus (arrow).

 

Figure 11
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  		Fig. 8B —60-year-old man with hematuria and histologically proven hemangioma. Axial fat-saturated gadolinium-enhanced T1-weighted 3D gradient-refocused echo MR image shows contrast enhancement of left renal sinus mass (arrows).

 

Figure 12
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  		Fig. 9 —47-year-old man with bilateral multiple renal sinuses and perinephric lymphangiomatosis. Unenhanced axial CT scan shows multicentric cystic masses in renal sinus and perinephric spaces (arrows).

 

Figure 13
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  		Fig. 10 —43-year-old woman with renal leiomyoma of capsular origin. Axial contrast-enhanced CT scan shows large, fairly homogeneous exophytic mass (arrows) arising from left kidney (K).

 

Figure 14
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  		Fig. 11 —23-year-old woman with hypertension refractory to standard treatment. Axial unenhanced CT scan shows large, expansile right renal mass (arrow) that was histologically proven to be juxtaglomerular cell neoplasm (reninoma). K = kidney, M = mass.

 

Figure 15
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  		Fig. 12 —57-year-old woman with incidental medullary fibroma (arrowhead). Patient underwent radical nephrectomy for renal cell carcinoma (Ca, arrow) of right kidney.

 

Figure 16
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  		Fig. 13 —40-year-old woman with histologically proven mixed epithelial and stromal tumor of kidney. Axial contrast-enhanced CT scan shows large complex cystic left kidney (K) mass (arrows) with septations and solid components.

 

Figure 17
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  		Fig. 14A —50-year-old woman with cystic nephroma. Coronal contrast-enhanced CT scan shows lobulated, expansile, cystic mass (M) in left kidney (arrow) that compresses calyces (C).

 

Figure 18
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  		Fig. 14B —50-year-old woman with cystic nephroma. Coronal T2-weighted MR image shows multilocular, septated cystic mass in left kidney (arrow) that herniates into renal pelvis. C = calyces.

 

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