Low field MRI on the diagueqs of nasopharynged carcinoma(NPC)

Abstract

Objective The MRI manifestdtions of NPC were analysed and low-field MRI on the diagnosis of NPC was disscussed.Methods The MRI manifestations cf 83 casea that were confirmed by biopsy were analysed retrospectively. Results The MRI of NPC manifese mainly as follow:The mucosa thickened or solf tissue mass formed on the top of posterior, left and right nasopharyngeal wall,Pharyngeal recess became supperficial and disappearing, And pharyngeal ostium of eustachian tube became dull or bstructive, The pharyngeal space displaced or narrowed and disappeared. unilteral or bilateral otomastoiditis can be seen and can be accompanied by the destruction of skull base, carernous sinus and orbit can be violated, and temporal fossa or pterygopalatine fossa can be involed .The T1WI signal of tumorous tissue was homogeneous or slightly low, the T2WI signal was slightly high or higher on the enhamced scanning, the amount(or ratio) of serer,moderate and mild enhanced cases were respectively 22(31.0%), 41(57.7%), 8( 11.3% ).Conclusions Low-fild MRI can imdicate muticfaceted clearly and accurately the location,size, shape, violating scope of NPC and the extent of involting adjacent tissue and structure, So the low-fild MRI is the best imaging examination on the diagnosis of NPC. Key words: Nasopharyngeal carcinoma(NPC); Low-fild MRI; Diagnosis