SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.
A tumor of intraepithelial T-lymphocytes, showing varying degrees of transformation but usually presenting as a tumor composed of large lymphoidcells. Tumor most commonly occurs in the jejunum or ileum. This disease is most commonly found in the setting of celiac disease.
Often preceded by celiac disease (gluten sensitive enteropathy) which is sometimes accompanied by intestinalulceration (ulcerative jejunitis), but this is not a true "precursor" or "transformation."
In 10-20% of cases the lymphoma is composed of monomorphic medium-sized cells. This monorophic variant may be called Type II EATL.