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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Copyright © 2002 by the American Roentgen Ray Society.