Which ultrasound feature is characteristic of sebaceous cyst contents?

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Multiple Choice

Which ultrasound feature is characteristic of sebaceous cyst contents?

Explanation:
Sebaceous cyst contents are keratinous debris rather than pure fluid, so they don’t look like a simple anechoic cyst. The keratinized material scatters ultrasound and gives internal echoes that are low to medium in strength. That internal echogenic material within the cyst is the key clue. There’s typically no internal vascular flow because the contents themselves aren’t vascularized. So, the finding of low to medium level internal echoes inside a cyst aligns with sebaceous (epidermoid) cyst contents, whereas anechoic appearance or vascularity would point away from this.

Sebaceous cyst contents are keratinous debris rather than pure fluid, so they don’t look like a simple anechoic cyst. The keratinized material scatters ultrasound and gives internal echoes that are low to medium in strength. That internal echogenic material within the cyst is the key clue. There’s typically no internal vascular flow because the contents themselves aren’t vascularized. So, the finding of low to medium level internal echoes inside a cyst aligns with sebaceous (epidermoid) cyst contents, whereas anechoic appearance or vascularity would point away from this.

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