Testicular epidermoid cyst
 Discussion of Testicular epidermoid cyst
- Uncommon benign tumors of germ cell origin that are also known as keratocysts,
- Epidermoid cysts range in diameter from 1 cm to 3 cm.
- They are nontender and usually palpable.
- Age at presentation is typically 20 to 40 years.
- If the diagnosis of an epidermoid is suspected at preoperative US, the lesion can be enucleated and frozen sections obtained to confirm the diagnosis. This procedure avoids the need for orchiectomy.
 Imaging Findings for Testicular epidermoid cyst
- Characteristic "onion ring" configuration with alternating layers of hyper- and hypoechogenicity have been described.
- These cysts do not show blood flow at Doppler US examination.
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 References for Testicular epidermoid cyst
- Vikram S. Dogra, Ronald H. Gottlieb, Deborah J. Rubens, and Lydia Liao. Benign Intratesticular Cystic Lesions: US Features. RadioGraphics 2001 21: 273S-281S.