Challenges in Diagnosing High-grade B-cell Lymphoma, NOS: Poor Interobserver Agreement on Its Morphologic Definition-An LLMPP Study. - Kurz KS; Ondrejka SL; Collinge B; Slack GW; Farinha P; Rosenwald A; Campo E; Amador C; Greiner TC; Raess PW; Song JY; Jaffe ES; et al. (The American journal of surgical pathology, 2026)