Most common site of Mucosa-associated lymphoid tissue
MALT lymphoma is a form of lymphoma involving the mucosa-associated lymphoid tissue (MALT), frequently of the stomach, but viually any mucosal site can be afflicted. It is cancer originating from B cells in the marginal zone of the MALT and is also called extranodal marginal zone B cell lymphoma. ref - pubmed.com
Duodenum
Jejunum
Ileum
Stomach
Abdomen and pelvis