Spermatocele is seen as a unilocular or rarely multilocular extratesticular cyst caused by cystic dilatation of tubules of the efferent ductules in the head of the epididymis.

On ultrasound studies, they appear as well-defined epididymal cystic lesions, with low-level fine internal echoes, usually measuring 1-2 cm with posterior acoustic enhancement. Thin septations may be present

Differential diagnosis

For complete discussion on radiological features and differentials please see: spermatocele.