Internal echoes: It means that the fluid is not homogenous. When the ultrasound beam passes thru fluid(or anything), a part of it bounces back or 'echoes' if it encounters something else. It is works exactly like sonar works over a body of water. So internal echoes in cyst fluid could be due to debris or blood mixed in with the fluid, or other things.
Answered 5/9/2019
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