ABSTRACT
Objective To analyze the CT features of cavitation between primary lung adenocarcinoma and squamous cell cancer.Methods The CT findings of cavity of primary lung adenocarcinoma and squamous cell carcinoma were evaluated in 57 patients,including 33 of squamous cell carcinoma and 24 of adenocarcinoma.The clinical data and CT features were analyzed retrospectively using the independent samples t-test,Pearson Chi-square test or Fisher's exact test.Results The mean age of ptients with squamous cell carcinoma was higher than that of patients with adenocarcinoma (65.57-4-9.26 vs 58.75 ± 11.12,P =0.015).Statistical differences were found in distribution of gender and smoking habit between the two kinds of carcinomas (P =0.014 and P =0.029).The T stages were also different between the two carcinomas (P=0.003).In addition,the maximum diameter of tumor (P =0.003),the maximum diameter of cavity (P =0.029) and the maximum thickness of the cavity wall (P=0.001) of squamous cell carcinoma were higher than those of adenocarcinoma.Moreover,the presence of ground-glass opacity (P =0.010),vessel passing through the cavity (P =0.001),septum inside the cavity (P＜0.001) and tumoral bronchogram (P =0.027) in adenocarcinoma were higher than those in squamous cell carcinoma.Conclusion There are significant differences between adenocarcinoma and squamous cell carcinoma in the population distribution and image features,comprehensive analysis helps the differential diagnosis.
ABSTRACT
Objective To explore the value of contrast-enhanced FLAIR imaging in diagnosis of leptomeningeal metastasis.Methods 23 cases of leptomeningeal metastasis with definite primitive-tumour were collected.All the cases were confirmed by clinic and laborotary examination.Of the 23 cases,7 cases underwent contrast-enhanced T1WI only,16 case underwent contrast-enhanced T1WI and FLAIR.Two groups were analyzed comparatively in diagnostic accuracy and displaying lesions between images of two sequence.Results(1)2 cases were missed,and 1 case was unsure diagnosed in T1WI contrast group;16 cases were all diagnosed accurately in both T1WI and FLAIR contrast-enhanced group.(2)11 cases with fine linear enhancement and 7 cases with small nodular enhancement were more obviously on contrast-enhanced FLAIR than that on contrast T1WI,but the thick linear enhancement were equal on two sequence.4 cases with more lesions were displayed on contrast-enhanced FLAIR images.The signal intensity on contrast FLAIR images were higher than that on contrast T1WI images at the same lesions.Conclusion Contrast-enhanced FLAIR has important value in diagnosing leptomeningeal metastasis.