Gradual scrotal swelling, no pain.
These are views of the upper pole of the testis, first longitudinal then transverse.
They show an anechoic fluid collection (hydrocele) around the testis and epididymal head.
If you examine the epididymal head carefully you will see the appendix testis / Hydatid of Morgagni appearing as a small nodular structure.
This is more obvious than usual because of the surrouding hydrocele.
Hydroceles are common and are generally anechoic fluid collections surrounding the testis. Occasionally bleeding or infection can cause of complicate a hydrocele and the anechoic fluid with become more echogenic, but will remain fluid and swirling ot layering debris may be evident.