Pilmatricoma (pilomatrixoma)

Is a rare benign tumor that grows withing the subcutaneous soft tissues.
it is associated with hair follicle matrix.

The lesion typically presents as a painless, firm, slow growing mass most commonly seen in the head
and neck, but they can also be seen in the trunk and extremities.

Usually seen in children the peak ages are 5-15 years. They can also be seen in adults and
there is a second peak of incidence in adulthood, years 50-65 years.

Recommended treatment is surgical excision.

Sonographically you’ll typically see a hypoechoic to mixed echogenicity ovoid structure within the subcutaneous layer. It does not extend deep to the fascia. It can have echogenic calcifications within
the lesion, there is also usually good posterior acoustic enhancement.

Color doppler usually shows intralesional flow, whereas a dermoid cyst or other
similar lesion will not have internal flow.



Click to access 1397.full.pdf


Images credited to:
American Institute of Ultrasound in Medicine (AIUM) Journal
Applied Radiology

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s