Primary duodenal follicular lymphoma with late disseminated nodal relapse responsive to rituximab monotherapy: A case report.

Gastrointestinal follicular lymphoma is a rare malignancy accounting for only 1-3.6% of primary non-Hodgkin lymphomas of the gastrointestinal tract and it is a relatively new clinical entity that was recently classified as a distinct variant of systemic follicular lymphoma. Therefore, data regarding long-term outcome are currently lacking. In addition, a consensus on the management of this disease has not been established and treatment strategies are derived from systemic follicular lymphoma. We herein report the case of a 51-year-old female patient diagnosed with duodenal follicular lymphoma who had nodal relapse nearly 5 years after complete remission. The patient was successfully treated with a 4-week course of rituximab during the initial diagnosis and relapse. To the best of our knowledge, this is the first case report to demonstrate the efficacy of a 4-week course of rituximab during both the initial diagnosis and nodal relapse. The aim of this report was to add to the limited available data on the treatment of gastrointestinal follicular lymphoma.