Primary intraocular lymphoma( PIOL) is mostly composed by diffuse large B-cell lymphoma with a high degree of malignancy and often masquerades as uveitis.Moreover, it has a poor prognosis,therefore the early diagnosis and treatment are very important.Cytology, cytokine analysis, immunohistochemistry and genetic testing are often used in combination to improve the diagnosis rate of PIOL,however, eye tissue biopsy is the gold standard for diagnosis of PIOL.Currently,since there is no unified treatment program...