BRAF and Papillary Craniopharyngioma: Buslei et al. analyzed the BRAF mutational status of 33 Rathke's cleft cyst and 18 papillary craniopharyngioma specimens by immunohistochemistry using a monoclonal antibody (V600E) that selectively recognizes the BRAF V600E mutant epitope and additional BRAF pyrosequencing.