What has the most favorable prognosis of all testicular tumors?

A 40 year old male presents to the outpatient center with an enlarged scrotum. The patient indicates that the symptoms began after he had a mountain biking accident. He eventually saw his family doctor who ordered an ultrasound. U/S: Ultrasound revealed a large anechoic space around the testis. Doppler demonstrated normal flow in the testicle, and torsion was ruled out. The most likely diagnosis is:

A 60 year old male is sent for an ultrasound because of a painless palpable mass in his right testicle. He was seen the week before for epididymitis. US show numerous small tubular cystic structures within the rete testis. The most likely diagnosis is:

Yolk sac tumors are also called what?

A 75 year old man went to the doctor because of painful urination and nocturia. He was diagnosed with prostatitis and a urinary tract infection. During the ultrasound there was an incidental finding of an anechoic, well-defined, circular lesion with posterior enhancement in the transitional zone of his prostate. His doctor told him not to worry because this was abenign finding. These findings are consistent with:

The most common cause of painless scrotal swelling is?

Most probably the abnormality is?

Prostatic acid phosphatase elevation is associated with what?

Epididymitis appears sonographically as a (n):

The most frequent cause of an acute scrotum in the post puberty male is?