Two cases of intraosseous squamous cell carcinoma of the mandible

Intraosseous carcinoma is known to be a very rare lesion. We present 2 cases of squamous cell carcinoma which occurred in the mandible. Case 1. 52-year-old male. This case was considered that the tumor arose from residual cyst of 167 region. We performed segmental resection of the mandible and now the patient was uneventful 5 years and 4 months after operation.Case 2: 47-year-old female. The origin of this case was obscure, but we diagnosed this tumor as a intraosseous carcinoma, because the oral mucosa was intact and no other lesion which causes metastasis was detected. We performed neck dissection and segmental resection of mandible. Metastatic lesions were found in the skull, ileum and lumbar vertebrae and the patient died 3 months after operation.