Duodenal-Type Follicular Lymphoma

**Semantic type:** Neoplastic Process

**Definition:** A localized low-grade follicular lymphoma within the gastrointestinal tract, which is distinct from other gastrointestinal tract follicular lymphomas. It has features that overlap with in situ follicular neoplasia as well as some features resembling an extranodal marginal zone lymphoma of mucosa-associated lymphoid tissue. The prognosis is excellent.