Fibrous cortical defect. Radiologic analysis of 6 cases

Fibrous cortical defect (FCD) is a local disturbance of ossification, more commonly seen in metaphysis of tubular bones of growing children, with predilection site around the knee joint. The roentgenographic appearances of 6 patients with FCD were characterized by an eccentric round or oval-shaped translucent area with lobulated sclerotic border, and the normal surrounding bone. The bony cortex was characterized by a superficially depressed defect which disappeared spontaneously and was labile. Multiple lesions were usually symmetric. Some patients had familial tendency.