TY - JOUR TI - Richter's transformation as leptomeningeal infiltration in a chronic lymphocytic leukemia patient receiving venetoclax. Could blood-brain barrier be a disease “sanctuary” during venetoclax treatment? AU - Dimou, M. AU - Bitsani, A. AU - Roumelioti, M. AU - Dimitrakopoulou, A. AU - Iliakis, T. AU - Pardalis, V. AU - Grafakos, I. AU - Kalyva, S. AU - Markopoulos, A. AU - Kyrtsonis, M.-C. AU - Panayiotidis, P. JO - Clinical Case Reports PY - 2021 VL - 9 TODO - 4 SP - 2249-2253 PB - Wiley-Blackwell Publishing Ltd SN - 2050-0904 TODO - 10.1002/ccr3.4002 TODO - azathioprine; CD20 antigen; CD23 antigen; CD5 antigen; CD79b antigen; chlorambucil; corticosteroid; cyclophosphamide; cyclosporine; cytochrome P450 3A; dexamethasone; fludarabine; ibrutinib; idelalisib; lactate dehydrogenase; methotrexate; petrafocon A HEM larafilcon A; rituximab; venetoclax, adult; Article; blood brain barrier; bone marrow biopsy; carcinomatous meningitis; case report; cell infiltration; cerebrospinal fluid analysis; chromosomal instability; chromosome aberration; chronic lymphatic leukemia; clinical article; cytogenetics; female; gene mutation; human; immunophenotyping; middle aged; nuclear magnetic resonance imaging; Sanger sequencing; splenomegaly TODO - Our unique case of Richter's Transformation presenting as leptomeningial infiltration in a CLL patient receiving venetoclax raises questions on whether the drug penetrates the blood-brain barrier and at what extend, especially in reduced doses given for drug-drug interactions. © 2021 The Authors. Clinical Case Reports published by John Wiley & Sons Ltd. ER -