Small bowel lesions located in long and multiple complex loop configurations were difficult to diagnose early because of vague clinical manifestations and because of the poor diagnostic yield of conventional examination methods. In this setting, double-balloon enteroscopy (DBE) was an epoch-making diagnostic and therapeutic tool for the management of patients with small bowel disease. Single-balloon enteroscopy (SBE), lacking a balloon at the endoscopic tip, is also a useful method for investigating and managing suspected small bowel lesions. Mucosa associated lymphoid tissue (MALT) lymphoma of the small bowel is relatively uncommon and remains a localized disease for long periods in most patients. Recently, we experienced a case of advanced-stage MALT lymphoma in the jejunum. A 60-year old female, with a history of anemia of unknown etiology and who was suspected of having a small bowel lesion, presented with complaints of vague abdominal pain and dizziness. She had undergone SBE via the oral route. She was diagnosed with MALT lymphoma of the jejunum and treated with medical management.