ALK and B-cell chronic lymphocytic leukemia: Histopathology and immunohistochemical analysis showed monotonous small cell B-lymphocytic infiltration (CD20+, CD5+, CD23+, ALK-) in both capsules, highly suggestive for chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL).<h4>Discussion</h4>CLL/SLL are classified as nearly the same disease.