Would a simple cyst in the breast appear isoechoic?

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Multiple Choice

Would a simple cyst in the breast appear isoechoic?

A simple breast cyst is fluid-filled and appears anechoic on ultrasound, meaning it shows up as a very dark area with posterior acoustic enhancement. Isoechoic means having the same brightness as the surrounding breast tissue, which would require the cyst contents to behave like tissue. Fluid in a simple cyst does not—the echoes are minimal, so it remains darker than the surrounding parenchyma, not the same. If a cyst had internal debris or septations, it would be considered complex and could show internal echoes, but that’s no longer a simple cyst. Therefore, a simple cyst would not appear isoechoic.

A simple breast cyst is fluid-filled and appears anechoic on ultrasound, meaning it shows up as a very dark area with posterior acoustic enhancement. Isoechoic means having the same brightness as the surrounding breast tissue, which would require the cyst contents to behave like tissue. Fluid in a simple cyst does not—the echoes are minimal, so it remains darker than the surrounding parenchyma, not the same. If a cyst had internal debris or septations, it would be considered complex and could show internal echoes, but that’s no longer a simple cyst. Therefore, a simple cyst would not appear isoechoic.

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