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Sonographic and MR Imaging Findings of Testicular Epidermoid Cysts

Jae-Ho Cho1, Jay-Chun Chang1, Bok-Hwan Park1, Jae-Gyo Lee1 and Chul-Ho Son2

1 Department of Diagnostic Radiology, School of Medicine, Yeungnam University, 317-1, Daemyungdong, Namgu, Taegu, 705-717, South Korea.
2 Department of Diagnostic Radiology, School of Medicine, Keimyung University, 194, Dongsandong, Junggu, Taegu, 700-712, South Korea.



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  		Fig. 1A. —11-year-old boy with right testicular epidermoid cyst that showed partially indistinct margin and lobulated contour on sonography. Sonogram shows heterogeneous solid-appearing lesion (arrows) surrounded by echolucent rim. Note that superior border (arrowheads) is partially indistinct.

 


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  		Fig. 2A. —20-year-old man with left testicular epidermoid cyst that contained calcifications. Sonogram shows heterogeneous lesion (arrows) of laminated appearance. Several echogenic foci (arrowheads) with posterior sonic shadowing representing calcifications are seen.

 


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  		Fig. 3A. —32-year-old man with right testicular epidermoid cyst that showed onionskin appearance on sonography. Color Doppler sonogram shows heterogeneous lesion (arrows) of onionskin appearance. Vascular flow signal is not noted.

 


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  		Fig. 4A. —19-year-old man with left testicular epidermoid cyst that showed target appearance on sonography and MR imaging. Sonogram shows heterogeneous lesion (arrows) surrounded by echogenic rim.

 


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  		Fig. 1B. —11-year-old boy with right testicular epidermoid cyst that showed partially indistinct margin and lobulated contour on sonography. T2-weighted MR image shows lobulated contour lesion of heterogeneous signal intensity intermixed with high, intermediate, and low signal intensities.

 


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  		Fig. 2B. —20-year-old man with left testicular epidermoid cyst that contained calcifications. T2-weighted MR image shows heterogeneous lesion containing low-signal-intensity foci.

 


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  		Fig. 4B. —19-year-old man with left testicular epidermoid cyst that showed target appearance on sonography and MR imaging. T2-weighted MR image shows high-signal-intensity lesion with central intermediate-signal-intensity focus.

 


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  		Fig. 3B. —32-year-old man with right testicular epidermoid cyst that showed onionskin appearance on sonography. T2-weighted MR image shows homogeneous high-signal-intensity lesion surrounded by low-signal-intensity rim.

 


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  		Fig. 4C. —19-year-old man with left testicular epidermoid cyst that showed target appearance on sonography and MR imaging. T1-weighted MR image shows low-signal-intensity lesion with central intermediate-signal-intensity focus.

 


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  		Fig. 1C. —11-year-old boy with right testicular epidermoid cyst that showed partially indistinct margin and lobulated contour on sonography. Unenhanced T1-weighted MR image shows lesion of heterogeneous signal intensity and partially indistinct margin (arrows).

 


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  		Fig. 1D. —11-year-old boy with right testicular epidermoid cyst that showed partially indistinct margin and lobulated contour on sonography. Fat-suppressed contrast-enhanced T1-weighted MR image shows sharply marginated low-signal-intensity mass without enhancement. Suppression of signal intensity in portions containing high lipid content is noted. Adjacent vessel (arrow) simulating enhancement is seen.

 


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  		Fig. 3C. —32-year-old man with right testicular epidermoid cyst that showed onionskin appearance on sonography. Fat-suppressed contrast-enhanced T1-weighted MR image shows sharply marginated homogeneous low-signal-intensity mass without enhancement.

 

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