Colorectal involvement of follicular lymphoma – findings with narrow band imaging and magnifying endoscopy
05. September 2013 (online)
Follicular lymphoma occurs rarely in the gastrointestinal tract. Although prior studies have reported cases of follicular lymphoma in the gastrointestinal tract by using advanced endoscopic imaging studies   , observation of colorectal involvement of follicular lymphoma using magnifying endoscopy with narrow band imaging (ME-NBI) has rarely been described.
A 69-year-old woman with follicular lymphoma underwent colonoscopy to investigate mild anemia and bloody stool. Colonoscopy showed multiple lymphomatous polyposis (MLP) through the whole colorectum ([Fig. 1]). ME-NBI highlighted coiled and elongated microvascular patterns on the surface of each lesion, and white opaque spots under the microvessels ([Fig. 2]). The microscopic examination of samples taken from the lesions showed the follicular structures consisting of medium-sized abnormal lymphoid cells with dense nuclei ([Fig. 3]). Immunohistochemical analysis revealed that the neoplastic cells were positive for CD20 and Bcl-2, but negative for CD3, and hence the patient was diagnosed as having colorectal involvement of follicular lymphoma.
We report a rare case of the colorectal involvement of follicular lymphoma, manifesting as MLP. The endoscopic findings with ME-NBI of colorectal follicular lymphoma have not been clarified. In this case, ME-NBI clearly identified the characteristic coiled and elongated microvascular patterns at the surface of each lesion, and white opaque spots under the microvessels. We believe that ME-NBI is useful for the diagnosis of colorectal follicular lymphoma.
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