Crystal-storing histiocytosis and Bing-Neel-like syndrome revealing a small B-cell lymphoma with plasmacytic differentiation, presumed to be a marginal zone lymphoma.

Crystal-storing histiocytosis and Bing-Neel syndrome are two diseases induced by paraproteins. Herein, we report a rare case of crystal-storing histiocytosis associated with Bing-Neel-like neurological manifestations in the context of a small B-cell lymphoma with plasmacytic differentiation, presumed to be a marginal zone lymphoma.