If transillumination of scrotum show a red glow the the nurse would suspect the presence of serous fluid in the scrotum.
When the processus vaginalis is not completely eliminated, a communication connection between the tunica vaginalis and the peritoneum permits serous fluid to gather around the testicles. Similar to testicular neoplasms, the ensuing hydrocele manifests as a painless swelling of the scrotum. Transilluminating the scrotum makes it easy to distinguish between the two situations because a solid tumor will not transmit light while a hydrocele will seem softly red.
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