Chondrosarcoma is the second most frequently seen malignant bone tumor after osteosarcoma, accounting for about 20%. The tumors develop as primary entities or secondary to malignant transformation of benign enchondroma and osteochondroma. we present such a case in a 12-year-old boy, reported to have received a hit on the right side of the face 6 months earlier and from that moment experienced intermittent cheek swelling and pain in combination with an incomplete ability to open the mouth.The MRI scan revealed several findings. Extending from the middle third of the mandibular ramus to the mandibular head, the bony structures were enlarged with multifocal loss of bony cortex.To classify the tumor surgical bone biopsy was performed to retrieve multiple osseous tissue samples. The pathology result and reference pathology were consistent with chondrosarcoma. Wide resection was executed en bloc together with the biopsy scar and track followed by adequate reconstruction.