MRI Diagnosis of Chondromyxoid Fibroma

Chondromyxoid fibroma originates from cartilage connective tissue and is mainly composed of myxoid cartilage. It usually occurs between the ages of 10 and 30, and is less common in people under 5 years old and over 60 years old. It is prone to occur in the lower limbs, especially the upper part of the tibia, followed by the lower end of the femur, the lower end of the fibula, the calcaneus, the humerus and the ilium. The main clinical symptoms are intermittent pain, and the course of the disease varies from several months to several years. A small number of patients are asymptomatic and are accidentally discovered after physical examination or trauma. Pathologically, the tumor is round, oval or lobed, with a smooth surface or round convex protrusions. The tissue structure is mainly composed of three components: cartilage-like, myxoid, and fibrous tissue, and the amount of each component is uncertain.

Imaging findings

The epiphysis of the long bones (about 2 cm from the epiphyseal line) is eccentrically destroyed in a cystic manner, with the long axis consistent with the long axis of the bone and clear edges; there is often a sclerotic edge on the medullary cavity side, the cyst wall may have bone ridges that penetrate deep into the cyst, the outer cortical bone expands and thins in a wavy shape, and calcification in the tumor is rare. The tumor signal on MRI varies due to differences in tumor composition, but most of them show long T1 and long T2 abnormal signals, cartilage, mucus and old blood show high signals, and there is obvious enhancement after enhancement.

The tumor signal on MRI varies due to differences in tumor composition, but most of them show abnormal signals of long T1 and long T2. Cartilage, mucus and old blood show high signals, fibrous tissue shows low signals, and there is obvious enhancement after enhancement.