Hydrocele

Abnormal serous fluid accumulation inside the scrotum, producing a typically painless, fluctuant scrotal swelling that transilluminates and may be communicating or noncommunicating. Possible causes are congenital hydrocele in infants, inflammation (orchitis, epididymitis, sexually transmitted infections), trauma, iatrogenic postoperative lymphocele, testicular tumor, kidney disease, or generalized fluid retention.