Ectomesenchymal chondromyxoid tumors (ECT) are rare, benign, intraoral mesenchymal soft tissue tumors that can be diagnostically challenging. In this study the demographic, clinical, histopathologic, and immunohistochemical features of seven ECTs are examined. The differential diagnosis of this rare neoplasm is discussed and the literature is reviewed.

The diffuse nuclear staining pattern of SOX2 is suggestive of a high-grade process in ameloblastic neoplasms. Numerous aggregates of cells harboring dense nuclear stain should raise concern for a malignancy.

B-cell lymphoma, unclassifiable, with features intermediate between diffuse large B-cell lymphoma and Burkitt lymphoma (DLBCL/BL) is a new category of B-cell lymphoma according to the 4 th edition of the World Health Organization Classification of Tumours of Haematopoietic and Lymphoid Tissues (2008). The following report presents a case of this rare, newly described entity on the palate of a 59 year-old male.

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Background: This case discusses a radiolucent lesion in the anterior mandible, which initially was thought to be due to endodontic failure. However, the final diagnosis was xanthogranuloma. Case description:We have reported a case of xanthogranuloma in the mandible found at the apices of two endodontically treated teeth. When present in the oral cavity, it can appear similar to several more common entities. While the radiolucent periapical lesion was thought to be the result of non-healing root canal therapy, the excisional biopsy yielded the diagnosis of xanthogranuloma. Removal of the lesion has resulted in excellent healing, as the surgeon expected. Practical implications:This case demonstrates the importance of biopsy in definitive diagnosis of oral lesions and lesions found at the apices of previously endodontically treated teeth.

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