Atypical Location and Appearance of Chondromyxoid of the Right Iliac Wing Fibroma in a Child

Aims: The chondromyxoid tumor is a benign primary bone tumor of cartilaginous differentiation whose location is atypical and rarely described in the literature.

Case Report: A 10 year old child, who consulted the emergency room of the children's hospital of Rabat for a hard and painful swelling of the right iliac fossa, rapidly increasing in volume. Biological tests were normal. The radiography showed a mixed lytic and condensing lesion, heterogeneous, of the right iliac wing, prompting an magnetic resonance imaging (MRI).

Discussion: Chondromyxoid fibroma usually affects young subjects and manifests clinically as pain and swelling. Pathological fractures are common.

On standard radiography, in long bones, there is an eccentric geographic gap, blowing out the cortex. On flat bones such as the iliac bone, the tumor is often polycyclic and mixed, combining condensation and bone lysis. Intratumoral microcalcifications may be encountered.

MRI is the key examination to evoke the diagnosis of chondromyxoid fibroma.

Conclusion: Imaging and in particular MRI plays multiple and fundamental roles in the management of chondromyxoid fibroma. MRI provides diagnostic guidance, particularly in the case of atypical localization.