Polyactin B (Pb) has been proved to have the effect of considerable tumor suppression. Recently,we used murine S_(180) Sarcoma as a model and observed the effect of Pb on the tumor—infiltrating immunocompetent cells, and also the infiltrating neutrophils and the alteration of small blood vessels within the tumor tissue. Compared with control: in Pb—treated group, there were more L_3T_4~+and Lyt_2~+ lymphocytes infiltrating in the periphery of the tumor ,and also within the tumor. In addition, the tumors had more prominant hyperemia, micro—thrombosis and neutrophil infiltration around the necrotic areas. The present findings suggest that the tumor—suppression effect of Pb might be mediated through TNF produced by immunocompetent cells.

Objective To analyze the CT findings of tuberculous lymphadenitis in parotid gland, so as to improve the diagnostic accuracy of tuberculosis of parotid gland. Methods Nine cases with tuberculous lymphadenitis in parotid gland confirmed by surgical pathology and acid-fast bacilli after preoperative spiral CT plain scan and two phases dynamic enhancement scan were retrospectively analyzed.Imaging findings of CT were reviewed and compared with surgical pathology. Results Seven of the 9 cases of tuberculosis of the parotid gland occurred in the left side, and 2 in the right side, and superficial lobe involvement occurred in 8 cases and deep lobe in 1 ease. The lesion was classified as tumour type (8 cases)and infiltration type (1 case). In tumour type, the number of lesion was from 1 to 4, and the size was from 2.7 to 5.3 cm in diameter. One case of infiltration type measured 3.4 cm in diameter. On CT plain scan,the lesions showed homogeneous slight high-density with regular edge in 5 cases and irregular low-density in 4 cases, and 2 of them with partly blurred edge. On CT enhanced scan, uniform moderate enhancement was seen in 3 cases, circular enhancement in 4 cases, inhomogeneous enhancement in 1 case, and lace-like enhancement in 1 case. Local infiltration occurred in 6 cases. Lymphadenovarix in the same side of lesion occurred in 2 cases. Conclusion CT findings of tuberculous lymphadenitis in parotid gland present diversification, which correlate well with pathological changes. Understanding of characteristic CT findings of tuberculous lymphadenitis in parotid gland is helpful for differential diagnosis, but final diagnosis still depends on pathology and acid-fast baeilli.

Objective To evaluate the value of digital tomosynthesis (TOMOS)in diagnosis of odontogenic cystic lesions of the jaws with oral fixed metal dentures, and compared with multi-slice spiral CT (MSCT). Methods The imaging findings of 40 cases with fixed metal dentures pathologically proved odontogenic cystic lesions of the jaws jn retrospective were retrospectively analyzed.All cases were performed by MSCT and TOMOS scanning,and 13 cases enhanced at the same time. The characteristics of the imaging findings in TOMOS and MSCT were compared. The diagnosis merits and disadvantages, especially their ability to detect the lesions and adjacent structures,were assessed. Results There were no significant difference (consistency check Kappa value>0.4) in evaluating the structure characteristics of the lesions, the relationgship between the lesions and cortex ,and the relationship between the lesions and surrounding organs. TOMOS is superior to MSCT in displaying apical change, the same in pure cystic and cystic-solid lesions interfered by artifacts.However, it is inferior to MSCT in detection of soft tissue invasion. Conclusion There is similar assessment value of TOMOS and MSCT in displaying odontogenic cystic lesions of the jaws. TOMOS can be chosen when the imaging findings of the lesions are interfered by metal artifacts.