Fig. 8
From: Testicular tumours in children: an approach to diagnosis and management with pathologic correlation
Epidermoid cyst. A 9-year-old boy with scrotal traumatism several days ago. a Longitudinal view of ultrasound colour Doppler image of the left testis shows an avascular intratesticular mass with alternating hyperechoic and hypoechoic rings (onion ring) (arrows). b Enucleated lesion seems a pearl because of its keratin component. A testis sparing surgery is practised. c Microscopic view of the pathologic specimen shows the cyst lined by squamous epithelium