Question
The sonographic finding of a cyst containing clear fluid is described as
The correct answer is
Anechoic
Sonographic Finding of Clear Fluid Cysts
In diagnostic ultrasound, the way tissues appear depends on how they reflect sound waves (echogenicity).
A cyst containing simple, clear fluid typically does not reflect sound waves significantly. This lack of echo reflection results in a very dark or black appearance on the ultrasound image.
The term used to describe this lack of echoes is:
- Anechoic: This means without echoes. Structures that are anechoic appear black on ultrasound. Clear fluid, such as in a simple cyst, is the classic example.
Other echogenicity terms describe different appearances:
- Hypoechoic: Means having fewer echoes than surrounding tissue; appears dark gray.
- Isoechoic: Means having the same echogenicity as surrounding tissue; appears similar in brightness.
- Hyperechoic: Means having more echoes than surrounding tissue; appears bright or white.
Therefore, a cyst containing clear fluid is described sonographically as anechoic.
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