Presence of Cells in Fresh-Frozen Allogeneic Bone Grafts from Different Tissue Banks.

Bone replacement materials have been widely used to reconstruct atrophic jawbones. Based on previous reports demonstrating the presence of viable cells in bone blocks even after processing by musculoskeletal tissue banks for orthopedic use, the aim of this study was to evaluate the presence of cells in bone blocks from three Brazilian tissue banks for maxillary reconstructions. All samples were processed by the respective tissue banks, according to the guidelines of the Brazilian National Sanitary Surveillance Agency.

Signet-ring cell change in adenoid cystic carcinoma: a clinicopathological and immunohistochemical study of four cases.

Aims: Signet-ring cell (SRC) change has not been reported in adenoid cystic carcinoma (ACC). The aim of this study was to describe the clinicopathological and immunohistochemical findings in four cases of ACC with SRCs (ACC-SRC), in which the relative proportion of the SRC component ranged from 25% to 50%.

Methods And Results: The median age was 58 years (range: 48-81 years), and all patients were women.