[Chondromyxoid fibroma of the left maxillary and ethmoid sinuses]. / Fibroma condromixoide de seno maxilar y etmoides izquierdos.

Chondromyxoid fibroma is an infrequent bone tumour in the craniofacial bones and exceptional in the paranasal sinuses. This unusual location, its non-specific clinical manifestation and aggressive behaviour with local destruction and a high recurrence rate can complicate precise diagnosis and treatment.