English

Abstract

We report a rare case of osteogenic sarcoma of zygomatic arch presenting in a 20 year old male patient and a review of world literature on incidence and imaging. Craniofacial osteosarcomas are rare primary malignant bone tumours. This paper presents a case of osteogenic sarcoma of left zygomatic arch, showing erosion of middle aspect of left zygomatic arch with sun-ray spicules noted perpendicular to the cortex with multiple conglomerated new bone formation and associated soft tissue swelling extending inferiorly into the left infratemporal fossa and later diagnosed as osteosarcoma with chondroblastic differentiation. In head and neck, the most common sites of origin are the mandible, maxilla, nasal septum, hard palate and skull vault. More than 50% of craniofascial osteosarcomas arise in the jaw. Mandible is more commonly affected than maxilla. Zygomatic arch is a very rare site of involvement. Osteosarcoma should be considered in the differential diagnosis of lytic lesions with associated soft tissue swelling of zygomatic arch. Only four cases of primary osteogenic sarcoma of zygomatic arch have been reported in the English- language