Richter's transformation as leptomeningeal infiltration in a chronic lymphocytic leukemia patient receiving venetoclax. Could blood‐brain barrier be a disease “sanctuary” during ve... oleh Maria Dimou, Aikaterini Bitsani, Maria Roumelioti, Aglaia Dimitrakopoulou, Theodore Iliakis, Vasileios Pardalis, Ioannis Grafakos, Sotiria Kalyva, Athanasios Markopoulos, Marie‐Christine Kyrtsonis, Panayiotis Panayiotidis