Most common extranodal site for non-hodkin&;s lymphoma is -
Extranodal marginal zone B cell lymphoma of MALT type also called as MALTOMA comprises about 8% of NHLs.In this most frequent is gastric lymphoma of MALT type. Reference : Harsh Mohan textbook of pathology, 7th edition.Pg no.357
Stomach
Brain
Intestines
Tonsils
Haematology