[A lymphoma originating from the stomach and contiguous lymph nodes. The majority are high-grade B-cell non-Hodgkin's lymphomas, some of which have developed through progression from low-grade lymphomas of mucosa-associated lymphoid tissue. Primary gastric lymphomas are often associated with Helicobacter Pylori infection. (WHO, 2000) — 2003 ( NCI )]
UMLS (NCI) C0349532