Abstract: Objective:To explore the imaging and clinical features of extranodal lymphoma in head and neck. Methods:51 extranodal lymphoma patients in head and neck were confirmed by surgery and pathology.The CT and MR images data were analyzed in comparison with surgical and pathological results.Diagnostic value of the CT and MR imaging were analyzed.Results:All 51 cases were non-Hodgkin lymphoma(NHL).Among all cases B-cell lymphomas accounted for 62.75%(32 cases).19 cases were T-cell lymphoma(37.25%).The most common site of extranodal lymphomas located in nasal cavity and pharynx ring.23 cases in nasal cavity(45.10%), 20 cases in pharynx ring(39.22%),The rest part 8 cases(15.69%),include:3 cases in orbit,2 cases in laryngeal, 2 cases in thyroid and 1 case in parotid.The lymph nodes metastases were observed in 18 cases.According tumor form all lymphoma were divided into three types:31 cases single mass type(60.78%),17 cases diffuse swelling type(33.33%),2 ulcer or necrotic type(5.89%).Conclusion:CT and MR images showed the special characteristics of head and neck extranodal lymphoma.Combined with clinical characteristics the imaging examinations could indicate the location,morphology,surrounding tissue and lymph nodes metastases and have great value in clinical diagnosis,staging and treatment.