CT And MRI Study Of Maxillofacial Diseases

Objective To investigate the CT and MRI manifestation of maxillofacial diseases so as to improve the diagnostic and differential accuracy of the diseases.Methods Fourty-three cases of patotid disease and 47 cases of soft tissue abnormality of cheeks comfirmed pathologically or clinically were selected and the imaging features were analysed.Results 1. The imaging manifestation of 43 cases of parotid disease could be divided into three types: (1)localized mass(n=35); (2)diffuse mass(n=5), all were malignant tumor; (3)diffuse swell but not mass(n=3), include 2 cases of parotitis and 1 case of angiocavernoma of parotid. Among the localized mass, 19 were benign tumor in which only 3 lesions were ill-defined, while 8 were malignant tumor in which 6 lesions were ill-defined, there was significant difference between them (P=0.006). As for the size of mass, relatively, mixed tumor of parotid gland was bigger than that of Warthin's tumor. The average diameter of mixed tumor of parotid gland was 4.3cm while the diameter of Warthin's tumor was 2.3cm, deviation between them was significant (t=2.737, P=0.020). 2. Fourty-seven cases of soft tissue abnormality of cheeks and the imaging appearances were as follows: (1) Fifteen cases were originated from sofe tissue of the cheeks in which 8 cases were benign and 7 cases were malignant. 6 cases were invaded by maxillofacial affection nearby, in which 1 case was benign and 5 cases were malignant. 26 cases were involved by lesions of jaw bones, including benign tumor of jaw bones in 9, malignant tumor of jaw bones in 14 and chronic osteomyelitis of jaw bones in 3 and all had bone destruction; (2) According to originated position, 21 cases were not originated from jaw bones, in which there were 5 cases (23.8ï¼…) with destruction of jaw bones; (3)In the 26 cases with abnormal soft tissue of cheeks originated from jaw bones, 9 were benign tumors in which all the soft tissue masses were mainly localized inside of the jaw bones, while 14 cases were malignant tumors in which All the soft-tissue masses were localized both inside and outside of the jaw bones. There was remarkable difference between the two groups(P=0.000). All 9 cases of benign tumors appeared as dilated destruction of jaw bones, while in the 14 cases of malignant tumors, 12 cases showed osteolytic bone destruction and the other 2 cases showed ossific bone destruction. There was significant difference between the two groups (P=0.000).Conclusions (1)According to the imaging findings combined with clinical manifestation, most parotid disease can be diagnosed correctly. (2) CT and MRI are of significance in judging original position, extent and differential diagnosis between benign and malignant lesions of abnormal soft tissue in cheeks.