Most common site for non-Hodgkins lymphoma outside the lymph nodes is
Liver
Spleen
Stomach
Brain
extranodal lymphomas can arise in viually any tissue, they do so most commonly in the gastrointestinal tract, paicularly the stomach Nearly 5% of all gastric malignancies are primarily lynphomas, the most common of which are indolent extranodal marginal zone B cell lymphomas- MALToma( mucosal associated lymphoid tissue). TEXT BOOK OF ROBBINS BASIC PATHOLOGY NINTH EDITION PAGE.571
G.I.T