RESUMO
Plasmablastic lymphoma (PBL) is a rare B-cell neoplasm with an aggressive clinical behavior that predominantly occurs in the oral cavity of human immunodeficiency virus (HIV)-positive patients. HIV-negative PBL has not been extensively reported. A 65-year-old female presented with anemia, who was HIV-negative. Gastrointestinal fiberscope (GIF), and colon fiberscope (CF) were performed. However, we could not detect the bleeding sites. We detected the tumor by capsule endoscopy, and obtained the tumor cells from the duodenal and jejunal sites. The neoplastic cells were diffusely positive for CD56, epithelial membrane (EMA), CD4, λ, and EBV-encoded RNA1 (EBER1) and partially positive for CD138 and CD79a. This patient was diagnosed as PBL. The small intestine is a rare extra-oral site of involvement in PBL patients, and only four cases in HIV-negative patients have been reported.