Histological analysis. (A) IDC (top right) with ILBCL (bottom centre) 130× magnification. (B) ILBCL in the surrounding breast tissue away from the IDC. Most of the blood vessels show darkly stained atypical lymphoid cells within their lumen 40× magnification. (C) Atypical lymphoid cells within the blood vessels 200× magnification. (D) CD20 reactive atypical large cells within the blood vessels 400× magnification. IDC, invasive ductal carcinoma; ILBCL, intravascular large B-cell lymphoma.