MRI appearances of primary orbital lymphoma

CHEN Fu-wen; LI Jian-rui; ZHENG Chun-sheng; HUANG Shi-bing; WANG An-le; YANG Long-lin

Abstract：Objective To study MRI appearances of primary orbital lymphoma in order to improve diagnostic accuracy of the disease .Methods Clinical data and MRI findings of 11 patients with pathologically proved primary orbital lymphoma observed from January 2007 to June 2013 were analyzed retrospectively .Results The characteristics of the tumor were that:① mostly located in extraconal and upper-before of the orbital septum ,inclined to upper-outside lateral quadrant of the orbit include eyelid ,lacrimal gland and conjunctiva ,etc;② no envelope and the tumor infiltrated intraorbital tissues a-long with extra ocular muscles;③ on MRI ,the lesion showed iso-tensity on T1WI and slight hypertensity on T2WI and the degree of enhancement inferior to extra ocular muscles with enhancement scanning ;④ all cases showed hyper-intensity on DWI;⑤ most tumors’ boundary were clearly and rare invaded of destructed adjacent structures ;and ⑥ cyst was relative-ly infrequent and hemorrhage and calcification were very rare .Conclusion The MRI appearances of primary orbital lym-phoma possess unique characteristics and multi-direction imaginges are helpful for making a correct diagnosis .