Abstract: Objective: To investigate the CT findings of Med-diffuse large B-cell lymphoma so as to promote the diagnosistic accuracy (Med-Dlbcl). Materials and Methods: female 7 cases, male 4cases. The age is in 23-42. CT findings of 11 cases with Med-Dlbcl were retrospectively assessed. Results: 11 Med-Dlbcl case, the misdiagnosis of CT is 9 of the thymus gland lump, only 2 example in consideration of the Med-Dlbcl. Conclusion: Rise year by year in China along with the outbreak rate that the Med-Dlbcl, the doctor of CT should promote the understanding that examines a patient to that disease.