ABSTRACT
Purpose To investigate the value of T2WI mild-moderate signal and restricted diffusion in the context of liver imaging reporting and data system (LI-RADS) (2014 edition) in the diagnosis of hepatocellular carcinoma (HCC) with cirrhosis caused by hepatitis B virus.Materials and Methods A total of 77 lesions (LI-RADS 3-5,size of 1.1 cm×0.7 cm-12.7 cm×9.1 cm) of 69 HCC patients in Beijing Friendship Hospital from January 2012 to November 2016 were retrospectively analyzed.All these patients underwent MRI scan and multiphase dynamic enhanced scan.The images were analyzed by two radiologists.If a disagreement occurred,liver accelerated volume acquisition and multiphase dynamic enhanced scan were combined to reach a consensus.The contrast noise ratio (CNR) and apparent diffusion coefficient (ADC) of T2WI and diffusion weighted imaging (DWI) sequences were compared,as well as the identification of the two signs.Results There was no statistically significant difference between T2WI mild-moderate signal and restricted diffusion in the identification of lesions (LI-RADS 3-5) (P＞0.05),while the sensitivity with DWI b=0 (61.0％) was significantly lower than DWI b=600 s/mm2 (70.1％) (P＜0.05).The CNR of all DWI sequences (b=0,600 s/mm2) were larger than those of T2WI (P＜0.01).The ADC of small lesions (diameter ＜2 cm) were larger than those of larger lesions (diameter ＞2 cm) [(1.57+0.37)×10-3 mm2/s vs.(1.37+0.51)×10 3 mm2/s,P＜0.05].Conclusion There is no significant difference in sensitivity of lesions between T2WI mild-moderate signal and restricted diffusion.However,due to different CNRs,DWI with b=600 s/mm2 is more obvious for the lesions,and can be first investigated in practice.
ABSTRACT
OBJECTIVE To investigate the characteristic computer tomography (CT) changes in cases of one-sided chronic ethmoid-maxillary sinusitis. METHODS The CT results of 76 patients diagnosed with one-sided chronic ethmoid-maxillary sinusitis were reviewed. RESULTS There were 51 patients with one-sided chronic ethmoid-maxillary sinusitis on the right side and 25 patients on the left side. There were 48 cases of obstruction of the ostium of the maxillary sinus. The characteristics of soft tissue lesions were mucosa hypertrophy and polypiform density spot. There were 9 cases with bony destruction. CONCLUSION More cases with pathologic changes on the left side were found. The obstruction of the ostium of the maxillary sinus and the abnormal anatomy of ostiomeatal complex were identified as important anatomical features of one-sided chronic ethmoid-maxillary sinusitis.
ABSTRACT
Objective To explore the diagnostic value of contrast-enhanced spiral CT after low tension and drinking water in papillary carcinoma of ampulla. Methods CT manifestations of papillary carcinoma of ampulla comfirmed pathologically in 20 cases were analysed retrospectively emphasized in artery phase on contrast CT which was performed after injecting 654-2 20 mg and drinking 300~500 ml water.Results Of all the cases , only 2 cases showed tumor filling defect in the descending part of duedenum nearby pancreas on routine CT, but all the cases showed more or less tumor filling defect on contrast-enhanced spiral CT . The diameters of the tumor were between 0.8 to 2.6 cm,2 cases with head of pancreas affected,the diameters of the tumor were between 2.4 to 2.6 cm.There were 2 cases with lymph node metastasis nearby duedenum.All the cases showed expansion of gallbladder ,intrahepatic duct and choledochus expanding in the liver. Conclusion Contrast-enhanced spiral CT after low tension and drinking water is superior to routine CT in determining the size and morphosis of tumor.