Mesenchymal chondrosarcoma is very aggressive and represents approximately 1% of all chondrosarcomas. While it affects a very wide age range, the peak frequency is in the second decade of life. It may occur in the head and rib region with a predilection for the maxillofacial skeleton. The small cell undifferentiated component may assume a hemangiopericytoma-like vascular pattern and should be distinguished from hemangiopericytoma. Treatment is en bloc resection, the intended tissue margins of excision should be designed to extend well beyond the actual tumor margin, as mesenchymal chondrosarcomas. Aggressive behavior of mesenchymal chondrosarcoma of the jaw, with a tendency for delayed recurrence and metastasis even many years after treatment. The most frequent site of metastasis was the lung. Here we present 52 years old, female case of mesenchymal chondrosarcoma occurs on Rt. mandible.