Patient Data
Age: 12
Gender: Male
From the case:
Fibrous cortical defect
Frontal

There is a cortical defect at the medial aspect of distal of femur.
Case Discussion
The findings are consistent of fibrous cortical defect. They are benign bony lesions, and is a type of fibroxanthoma, histologically identical to the larger non-ossifying fibroma (NOF).