Paint brush borders sign

Last revised by Rohit Sharma on 4 Apr 2024

The paint brush borders sign may be seen on MRI of a giant cell tumor, at the margin between the lesion and the normal bone. The sign specifically refers to the jagged interface as the tumor penetrates into the bone which mimics the profile of the bristles of a paint brush.

Presence of the paint brush borders sign has been shown to be a risk factor for local recurrence of giant cell tumor 1.

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