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Objective To study the radiological appearance and pathological features of breast phyllodes tumors(PTs), and to enhance the knowledge of the tumor.Methods Clinical and imaging findings were reviewed retrospectively in 65 women with PTs confirmed by surgical pathology.61 patients had preoperative MRI and/or sonography, and 44 had preoperative mammography.Then these findings were compared with the pathological results.Results (1)The percentages of benign, borderline and malignant PTs were 32.3%(21/65), 43.1%(28/65) and 24.6%(16/65), respectively,and the mean maximum diameters of these lesions were (4.75±2.62) cm, (5.37±3.11) cm and (4.96±3.82) cm, respectively.There were no statistical difference in lesion''s size among these three types(F=0.247,P=0.782).(2)On the mammograms of these 44 PTs(including 16 cases of benign type, 18 cases of borderline and 10 cases of malignant type), the appearances of radiolucent halo and calcification among these three types showed statistically significant differences(both P<0.05).(3)On the sonography of these 61 PTs(including 19 cases of benign type, 26 cases of borderline and 16 cases of malignant type), the shape among these three types showed statistically significant difference(P<0.05).(4)On the MRI of these 61 PTs(including 21 cases of benign type, 24 cases of borderline and 16 cases of malignant type), internal hypointense septations on T2WI and time intensity curves showed statistically significant differences among these three types(both P<0.05).Conclusion Some radiological appearances of PTs can be used to help determine the histologic subtypes of breast PTs preoperatively.
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Objective To discuss MRI characteristics of dysplastic gangliocytoma of the cerebellum.Methods MRI manifesta-tions of 13 cases with dysplastic gangliocytoma of the cerebellum verified by operation and pathology were analyzed retrospectively. Results All of 13 cases were located in the cerebellar hemisphere and vermis.The lesions presented striated pattern of iso-intensity signal and hypo-intensity signal on T1-weighted images.The sign of tiger stripes was the feature in dysplastic gangliocytoma on T2-weighted and FLAIR images.All of the tumors showed slightly striated enhancement after intravenous administration of contrast agent.The mass effects of dysplastic gangliocytoma of the cerebellum along with the forth ventricle and brain stem oppressed were seen in all cases.NAA was mildly reduced on magnetic resonance spectroscopy (MRS)in 7 cases of dysplastic gangliocytoma of the cerebellum.Conclusion There are distinctive manifestations in MRI images for dysplastic gangliocytoma of the cerebellum,which has crucial diagnostic value before operation.
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Objective To evaluate the value of MSCT in the diagnosis of extrahepatic cholangiocarcinoma.Methods The MSCT appearances of extrahepatic cholangiocarcinoma confirmed by pathology in 27 cases were analyzed retrospectively.Among them,20 patients underwent plain and four-phase dynamic contrast-enhanced CT scans including early arterial phase,late arterial phase,portal phase and delay phase,7 patients only underwent contrast-enhanced CT scans.Results 15 lesions were located in the hilar and 12 lesions were located in the common bile duct.CT features of cholangiocarcinomas in this group were varied with its position and growth pattern.Besides the direct sign such as delay enhancement,the indirect findings were also specific such as hepatic lobe atrophy,dilated bile duct,etc.Conclusion MSCT is of great value in diagnosis of extrahepatic cholangiocarcinoma.