Synchronous diffuse large B-cell lymphoma masquerading as jejunojejunal intussusception with unexplained pleural effusion in elderly male: A rare manifestation

The primary gastrointestinal lymphoma is uncommon. This is a confirmed case of synchronous primary diffuse large B-cell lymphoma manifested as jejunojejunal intussusception with lymph nodal and pleural metastasis. Its clinical manifestations, morphological characteristics, immunophenotypes, and molecular biological characteristics are very different, which is the biggest challenge before surgery.