Which phenomenon occurs when cysts and liquids attenuate less sound, making the region below the fluid-filled structure appear brighter?

Which phenomenon occurs when cysts and liquids attenuate less sound, making the region below the fluid-filled structure appear brighter?

• A. Anechoic
• B. Through Transmission Enhancement
• C. Hypoechoic
• D. Artifacts

Answer: (B)

Through transmission enhancement, also known as posterior acoustic enhancement, is the effect at play. Fluids like cysts attenuate ultrasound less than solid tissue, so more sound energy reaches and passes beyond the fluid-filled structure. That extra energy makes the region behind the cyst appear brighter on the image. This is a characteristic sign that helps distinguish fluid-filled structures from solid ones, which tend to attenuate more and can produce posterior shadowing. Anechoic describes the fluid-filled structure itself (it looks black), hypoechoic refers to a relative decrease in brightness of a region, and artifacts are a broad category that doesn’t specifically capture this consistent post-fluid brightening.

Through transmission enhancement, also known as posterior acoustic enhancement, is the effect at play. Fluids like cysts attenuate ultrasound less than solid tissue, so more sound energy reaches and passes beyond the fluid-filled structure. That extra energy makes the region behind the cyst appear brighter on the image. This is a characteristic sign that helps distinguish fluid-filled structures from solid ones, which tend to attenuate more and can produce posterior shadowing. Anechoic describes the fluid-filled structure itself (it looks black), hypoechoic refers to a relative decrease in brightness of a region, and artifacts are a broad category that doesn’t specifically capture this consistent post-fluid brightening.