Fig. 1

a Surgical specimen of excised simple testicular epidermoid cyst. Largest diameter of cyst 1.2 cm. Note the sharply demarcated rim of cyst and the yellowish amorphic mass inside. At the external side of the rim small layer of normal testicular tissue (brownish). b B-mode sonography of testis harbouring epidermoid cyst. Note the typical onion ring shape of the cyst core. c, d Contrast enhanced ultrasonography (CEUS) of testis with simple epidermoid cyst. Dual display with B-mode scan (right side of figure) and CEUS imaging (left side of figure). Note the absence of contrast material (air bubbles) in the centre of the cyst, indicating avascular area