Nonossifying fibroma/fibrous cortical defect. Left. AP radiograph image showing a fibrous cortical defect arising medially and a nonossifying fibroma arising laterally in the distal femoral metaphysis. Top right. Axial CT image showing a fibrous cortical defect arising medially and a nonossifying fibroma arising laterally in the distal femoral metaphysis. Middle right. Axial T1-weighted image showing a fibrous cortical defect arising medially and a nonossifying fibroma arising laterally in the distal femoral metaphysis. Bottom right. Axial T2-weighted fat-suppressed images showing a fibrous cortical defect arising medially and a nonossifying fibroma arising laterally in the distal femoral metaphysis. The CT confirms the cortical origin of both lesions and the low signal intensity on the MR images the predominantly fibrous nature of the matrix.
Non ossifying fibroma