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DOI: 10.1148/rg.252045153
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Intrarenal Teratoma1

David J. Choi, MD, PhD, E. Christine Wallace, MD, Armando E. Fraire, MD and Daniel Baiyee, MD

1 From the Departments of Radiology (D.J.C., E.C.W.) and Pathology (A.E.F., D.B.), University of Massachusetts Medical School, 55 Lake Ave North, Worcester, MA 01655. Received July 30, 2004; revision requested October 19 and received December 8; accepted December 8. All authors have no financial relationships to disclose.


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  		Figure 1.  Transverse US image of the upper pole of the right kidney shows a large mass (outer cursors) consisting of a mantle with intermediate echogenicity and a hypoechoic central region (inner cursors).

 


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  		Figure 2.  Axial contrast material–enhanced CT scan shows a right upper quadrant mass with a fatty mantle and a fluid-attenuation central component.

 


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  		Figure 3a.  (a) Axial fat-saturated fast spin-echo T2-weighted MR image helps confirm the fatty nature of the mantle of the mass. (b) Coronal gadolinium-enhanced fat-saturated spoiled gradient-echo MR image demonstrates the claw sign with no enhancement of any part of the mass.

 


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  		Figure 3b.  (a) Axial fat-saturated fast spin-echo T2-weighted MR image helps confirm the fatty nature of the mantle of the mass. (b) Coronal gadolinium-enhanced fat-saturated spoiled gradient-echo MR image demonstrates the claw sign with no enhancement of any part of the mass.

 


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  		Figure 4.  Photograph shows the sectioned mass with a yellow-orange mantle and a grayish, friable center containing hair shafts.

 


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  		Figure 5.  Photomicrograph (original magnification, x100; hematoxylin-eosin stain) shows adipose tissue (A), along with pilosebaceous elements (B) and keratinizing squamous epithelium (C).

 




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