Bing–Neel syndrome
Bing–Neel syndrome (BNS) is an extremely rare neurologic complication of Waldenström macroglobulinemia (WM), which is a chronic lymphoproliferative disorder. There's no clear definition of BNS but what is known so far is that unlike WM, It involves the central nervous system (CNS), infiltrated by differentiated malignant B cells and by having hyperglobulinemia.