Doppler ultrasound of a sebaceous cyst typically shows what finding?

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Multiple Choice

Doppler ultrasound of a sebaceous cyst typically shows what finding?

Explanation:
The key idea is that sebaceous cysts are avascular structures. On Doppler, the interior should show no blood flow because the contents are keratinous material within a fibrous wall, not vascular tissue. This absence of internal flow helps distinguish a sebaceous cyst from solid masses or inflammatory lesions that would typically exhibit internal vascularity or at least peripheral hyperemia. Occasionally, mild flow around the lesion can be seen due to surrounding inflammation, but the cyst interior itself remains without vascularity.

The key idea is that sebaceous cysts are avascular structures. On Doppler, the interior should show no blood flow because the contents are keratinous material within a fibrous wall, not vascular tissue. This absence of internal flow helps distinguish a sebaceous cyst from solid masses or inflammatory lesions that would typically exhibit internal vascularity or at least peripheral hyperemia. Occasionally, mild flow around the lesion can be seen due to surrounding inflammation, but the cyst interior itself remains without vascularity.

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