Abstract
Primary splenic diffuse large B-cell lymphoma (DLBCL) is a rare type of non-Hodgkin's lymphoma. It often presents with abdominal pain or splenomegaly. We present a case of a 68-year-old male who presented to the emergency department with left sided abdominal pain. Workup revealed massive splenomegaly and thrombocytopenia. A splenic biopsy confirmed the diagnosis of primary splenic DLBCL. The patient was treated with chemotherapy. This case highlights the importance of considering primary splenic DLBCL with splenomegaly and treating it with chemotherapy and/or splenectomy.