I can feel the tubes which lead down to the testicles seem to be the origin, the area directly above, ie the right hand side of the base of the penis and the testicle aches. Briefly, I have had three visits to Hospital, the first doc diagnosd hydrocele, in the second I had an ultrasound scan, this seemed to confirm the hydrocele but in the centre of the right testical a small white fleck was noticed. Unfortuately we did'nt discuss the hydrocele to any great extent. In fact that is one of the indications to operate on a patient with a hydrocele. It consists of fluid that is not reabsorbed by the body.
Most hydroceles grow to a certain size and then stabilize.
They are acutely caused by local injury, radiotherapy, acute nonspecific or Tuberculous epididymitis, or orchitis. It could even occur secondary to a neoplasm. A chronic hydrocele is more common, it usually occurs in men past the age of 40. This later type of hydrocele is more likely your problem. Your ultrasound result is difficult for me to assess because I cannot see the film.