18F-FDG PET/CT and MRI Imaging Features of Monomorphic Epitheliotropic Intestinal T-cell Lymphoma Involving the Liver and Lymph Nodes: A Rare Case Report

Abstract Background: Monomorphic epitheliotropic intestinal T-cell lymphoma (MEITL) is an uncommon, rapidly progressive, primary intestinal T-cell lymphoma. The most common site of occurrence is the small intestine. The prognosis of MEITL is extremely poor due to late diagnosis and lack of targeted therapy.Case presentation: A case of MEITL involving the entire small bowel, part of colon, rectum, mesenteric lymph nodes and liver is herein reported. We are presenting the 18F-FDG PET/CT features of MEITL, which showed all involved lesions with increased FDG activity. The MRI and pathological characteristics of MEITL were also described. Furthermore, some malignant diseases should be considered in the differential diagnosis. Conclusions: Based on the lesions with high accumulation of FDG, our case shows the involved extent of MEITL, which is helpful for biopsy and treatment option decisions. We expect more and more physicians could know this disease and make an early diagnosis to improve the outcomes of MEITL.