Nonossifying fibroma

Spontaneously regresses
AKA "fibrous cortical defect"
- Though some will call fibrous cortical defect as <2 and NOF as >2 cm
Do not touch lesion
Classic appearance is thin, sclerotic border that is scalloped and slightly expansile
They routine "heal" with sclerosis and disappear
Don't mistake "cortical disruption" for simply cortex being replaced with benign fibrous tissue
Can look hot on PET during "healing" phase d/t osteoblast activity