67-year-old male complaint of pain abdomen for 2-3 weeks. From the images below identify the likely disease?
Microscopic examination of the Ileal biopsy showed features of a lymphoproliferative disorder.
IHC performed showed neoplastic cells are diffusely positive for CD20, PAX5, BCL6 and BCL2 and are negative for CDX2. KI67 labelling index is upto 75-80%.