Intraductal Papillary Mucinous Neoplasm: New Insights Into Its Origin and Nomenclatures.

Background: Mucinous cells can be detected sporadically or may constitute the primary tumor component in salivary gland tumors, as observed in the intraductal papillary mucinous neoplasm (IPMN). This low-grade tumor is composed of mucinous columnar cells organized into papillary cystic structures. The present study aimed to compare the mucous cells in IPMN with mucous cells present in mucoepidermoid carcinoma (MEC) and papillary cystadenoma (PC).

Adenomatoid odontogenic tumor: Features of ameloblastic-like epithelial cells differentiation, secretion, and the nature of tumor cells products.

Background: This study aimed to investigate the differentiation of ameloblastic-like cells and the nature of the secreted eosinophilic materials in adenomatoid odontogenic tumors.

Methods: We studied histological and immunohistochemical characteristics of 20 cases using: cytokeratins 14 and 19, amelogenin, collagen I, laminin, vimentin, and CD34.

Results: Rosette cells differentiated into ameloblastic-like cells positioned face-to-face, displaying collagen I-positive material between them.

Fast and accurate protocol for histology and immunohistochemistry reactions in temporomandibular joint of rats.

Objective: Propose a standard, fast and accurate protocol for the processing of the temporomandibular joint (TMJ) of adults' rats for histology and immunohistochemistry reactions.

Design: Wistar male rats were perfused with paraformaldehyde (4 %). The heads were fixed in formaldehyde 10 % solution for 48 h.

Neutrophils in oral paracoccidioidomycosis and the involvement of Nrf2.

Neutrophils have been implicated in granuloma formation in several infectious diseases, in addition to their main phagocytic and pathogen destruction role. It has been demonstrated that Nrf2 regulates antioxidant protection in neutrophils, attenuating inflammation without compromising the hosts bacterial defense. In this study, we analyzed the presence of neutrophils in Paracoccidioides brasiliensis mycosis (PCM), as well as the immunoexpression of Nrf2.