In this PACULit episode, Britany and Seth discuss Sachanas et al.'s August 2025 study on B-cell prolymphocytic leukemia cases that mimic splenic marginal zone lymphoma. The hosts review how SMZL-like biology can occur within B-PLL phenotypes, evaluate Rituximab monotherapy as a safer alternative to chemotherapy or splenectomy, and emphasize the importance of comprehensive immunophenotyping and cytogenetics to guide therapy. Key findings include complete remission in 40% and prolonged responses in 80%, the relevance of 7q deletions, and the study's limitations and implications for future guidelines and personalized treatment in older or frail patients.