A primary intraosseous carcinoma (PIOC) is a squamous cell carcinoma arising within the jawbone andshould be differentiated from a malignant ameloblastoma. It is not due to arising from an odontogenic cyst or tumor. The possibility of the lesion being a metastasis fromanotherprimary site should be considered, and excluded by a careful history and examination. The diagnosis of a PIOC is rare, but it is often worth considering in any differential diagnosis of jawradiolucency. The prognosis associated with primary intraosseous carcinoma of the jaws is poor and needs for aggressive treatment. It is common for these patients to present with apparent routine dental.This paper reports a case PIOC of the maxilla. The patient was a 68-year-old woman with a chief complaint of swelling of her hard palate.