2017年 · 第51卷第03期

The prevalence of primary hepatocellular carcinoma (HCC) ranks sixth in the world, with about 600,000 people getting sick every year. It is highly malignant and progresses rapidly, and about 80% of patients have lost surgical resection when they are discovered^[1]。 radiofrequency ablation (RFA) is effective in the treatment of HCC and has been widely recognized in clinical practice. How to evaluate the efficacy of RFA by imaging examination is a hot issue for clinical and imaging physicians^[2]。 DWI is an imaging method to observe the microscopic diffusion ability of water molecules in living tissues. The diffusion speed of water molecules can be expressed by ADC values, which can quantitatively reflect capillary perfusion and molecular diffusion ability in vivo. Therefore, theoretically, DWI can reflect the biological tissue characteristics of living organisms and be used to evaluate the necrosis of tumor tissues. The purpose of this study is to evaluate the early efficacy of RFA in rabbit VX2 liver cancer by DWI, so as to guide the clinical development of follow-up treatment plan.

Castleman disease (CD), also known as giant lymph node hyperplasia, is a rare and unknown lymphoproliferative disease characterized by enlarged lymph nodes^{[1,2,3,4,5,6,7,8,9,10,11]}。 CD is divided into three types according to histopathological characteristics^[2]: hyaline vascular type (HV), plasma cell type (PC) and mixed type; According to the range of lymph node involvement, it is divided into monocentric (UCD) and multicentric (MCD)^[2]。 At present, the imaging studies of CD at home and abroad focus on lymph node manifestations^[1,2,3,4]For pulmonary manifestations, there are not many reports at home and abroad; Among them, detailed summary reports of UCD lung CT manifestations are rare at home and abroad. The author retrospectively analyzed the chest CT images of 5 cases with UCD confirmed by pathology, and reviewed the literature^{[1,2,3,4,5,6,7,8,9,10,11]}The CT findings of the lung were summarized in detail, aiming to improve the imaging understanding of the lung manifestations of this disease.

congenital extrahepatic portosystemic shunt (CEPS) is a congenital developmental malformation caused by abnormal development of the portal venous system. Blood flow from the portal venous system flows partially or completely directly back into the vena cava system through an abnormal extrahepatic shunt. CEPS is very rare. At present, more than 100 cases have been reported in domestic and foreign literatures^[1,2,3]Most of them are case reports, and the application value of spiral CT in clinical diagnosis and treatment is rarely reported. Combined with intraoperative portal system angiography, the CT findings of 4 cases of CEPS treated by surgery were retrospectively analyzed, and the application value of spiral CT in preoperative diagnosis, selection of surgical methods and prognosis was preliminarily discussed.