Recurrent adenoid cystic carcinoma of paranasal sinuses: A rare case report.

Adenoid cystic carcinoma (ACC) is a distinct salivary gland neoplasm that predominantly occurs in the minor salivary gland. ACC is an uncommon tumor that progress slowly affecting 5% of paranasal sinuses with high distant metastasis rate in advance stages. This salivary gland tumor is difficult to diagnose both clinically and histopathologically due to its indolent presentation and diverse histopathological patterns.

Central Odontogenic Fibroma of the Mandible.

The central odontogenic fibroma (COF) is a benign odontogenic tumor of mesenchymal tissue such as the periodontal ligament, dental papilla or dental follicle. It is an extremely rare tumor, accounting less than five percent of all odontogenic tumors. In this report, we describe the case of an eight year old girl who presented with a painless swelling of the left mandible.