Plain film features are characteristic of a fibrous cortical defect. It is a benign bony lesion that is usually small in size, occurs in skeletally immature children between age 2-15 years, and usually asymptomatic. It is typically seen in the distal femur, proximal and distal tibia. 

It is one of the skeletal “Don’t touch” lesions. Lesions larger than 2 cm are called non-ossifying fibromas.