Testicular Epidermoid Cyst : Ultrasound
The ultrasound appearance of a testicular epidermoid cyst is characteristic. The tumor appears as a well-circumscribed intratesticular mass with alternating hyperechoic and hypoechoic rings, demonstrating a lamellar ("onion skin") appearance due to the arrangement of keratinous material in distinct layers. There is no vascularity within the testicular lesion. The surrounding testis is normal.
Case courtesy of Dr Callum Smith , Radiopaedia.org. From the case rID: 54185