Which condition would appear sonographically as a fluid collection surrounding the testicle?

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Multiple Choice

Which condition would appear sonographically as a fluid collection surrounding the testicle?

A hydrocele appears as a fluid collection surrounding the testicle because it fills the tunica vaginalis, the serous sac that envelopes the testis. On ultrasound this shows up as an anechoic (dark) fluid space around the testicle with the testis itself well seen inside, typically without internal echoes or vascular flow. Other possibilities don’t fit this pattern as well. A hematocele contains blood and is often complex or echogenic, sometimes with layering debris after trauma. An epididymal cyst is a discrete cystic structure in the epididymis adjacent to the testis, not a fluid sleeve around the testicle. A varicocele consists of dilated veins in the pampiniform plexus and appears as serpiginous anechoic channels with venous flow on Doppler, not as a surrounding fluid collection.

A hydrocele appears as a fluid collection surrounding the testicle because it fills the tunica vaginalis, the serous sac that envelopes the testis. On ultrasound this shows up as an anechoic (dark) fluid space around the testicle with the testis itself well seen inside, typically without internal echoes or vascular flow.

Other possibilities don’t fit this pattern as well. A hematocele contains blood and is often complex or echogenic, sometimes with layering debris after trauma. An epididymal cyst is a discrete cystic structure in the epididymis adjacent to the testis, not a fluid sleeve around the testicle. A varicocele consists of dilated veins in the pampiniform plexus and appears as serpiginous anechoic channels with venous flow on Doppler, not as a surrounding fluid collection.

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