A Study Of CT/MRI Manifestations Of Benign And Malignant Mass In The Nasal Cavity

Objective To investigate the CT and MRI characteristics of benign and malignant mass inthe nasal cavity for improving the diagnostic accuracy of diseases.Methods323cases of nasal mass confirmed by pathology in our hospital from Jan2006toJan2013were selected,14imaging characteristics were analyzed by two radiologists inconsensus. These imaging characteristics include unilateral/bilateral, morphology, margins, bonechange, region of tumor, growth pattern, tumor center, tumor base, growth direction, CT density,MRI signal, CT/MRI enhanced pattern, the existence of calcific foci, necrotic foci andhemorrhagic foci and change of surrounding structures. Statistical analysis was made on thecorrelation of imaging characteristics and behavior of nasal mass.Results There were233benign cases (72.14%) and90malignant cases (27.86%) in all323cases. Tumor morphology, margins, bone change, region of tumor, growth pattern, tumor base,growth direction, MRI enhanced pattern, the existence of necrotic foci and change ofsurrounding structures were correlated with the behavior of nasal mass,(P<0.05). Bone erosionand infiltrative growth pattern are the two essential indicators for diagnosis of malignant tumor.Most of the malignant tumors were found to have an irregular shape and ill-defined boundary.The masses grow exceeding to the nasal cavity, and infiltrate the external fat-pad of themaxillary. In addition, the necrosis or cysts of masses in the nasal cavity was common inmalignant tumors.Conclusion Tumor morphology, margins, bone change, region of tumor, growth pattern,tumor base, growth direction, MRI enhanced pattern, the existence of necrotic foci and change ofsurrounding structures are important predicting makers for differentiation of benign andmalignant nasal mass.