ABSTRACT
OBJECTIVE: Differentiating unicystic ameloblastomas from keratocystic odontogenic tumors (KCOT) is necessary for the planning of different treatment strategies; however, it is difficult based on conventional CT and MR sequences alone. The purpose of this study was to investigate the utility of diffusion-weighted imaging (DWI) and apparent diffusion coefficients (ADCs) in the differentiation of the two tumors. MATERIALS AND METHODS: We prospectively studied 40 patients with odontogenic cysts and tumors of the maxillomandibular region using conventional MR imaging and DWI. ADCs were measured using 2 b factors (500 and 1000). RESULTS: Unicystic ameloblastomas (n = 11) showed free diffusion on DWI and a mean ADC value of 2.309 ± 0.17 × 10-3 mm2/s. KCOT (n = 15) showed restricted diffusion on DWI with a mean ADC value of 0.923 ± 0.20 × 10-3 mm2/s. The ADC values of unicystic ameloblastomas were significantly higher than those of KCOT (p < 0.001, Mann-Whitney U-test). An ADC cut-off value of 2.0 × 10-3 mm2/s to differentiate KCOT and unicystic ameloblastomas resulted in a 100% sensitivity and 100% specificity. Dentigerous cysts (n = 3) showed restricted diffusion on DWI and similar ADC values (1.257 ± 0.05 × 10-3 mm2/s) to those of KCOT. CONCLUSION: Diffusion-weighted imaging and ADC determination can be used as an adjuvant tool to differentiate between unicystic ameloblastomas and KCOT, although the ADC values of dentigerous cysts overlap with those of KCOT.
Subject(s)
Humans , Ameloblastoma , Dentigerous Cyst , Diffusion , Magnetic Resonance Imaging , Odontogenic Cysts , Odontogenic Tumors , Prospective Studies , Sensitivity and SpecificityABSTRACT
Objective To understand the Salmonella carrying situation among the employees of public places and dietetic in dustries in Chengdu railway area to enhance the health management among employees in catering and service industries and provide the basis for preventing the occurrence and outbreak of food poisoning.Methods The anal swab culture was adopted to perform the health carriage examination among the employees of public places and dietetic industries during 2011-2015.The isolated Salmonellas were identified by stereotyping and the relationship between Salmonella carrier state with seasons and years was analyzed.Results Among 86 971 detected samples,43 strains of Salmonella were detected with the detection rate of 0.49‰.Nineteen serotypes were identified,which were dominated by Salmonella derby,Salmonella Senftenberg and Salmonella typhimurium.The highest detection rate was in summer and autumn.Conclusion The stains types of Salmonella carried by employees in catering and service in dustries in Chengdu railway area were complex,and the detection rate was closely related to seasonal variation.It is needed to strengthen the health examination and prevent food poisoning occurrence.
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Objective To explore the clinical significance and safety in hemihepatectomy for hepatoma without inflow occlusion.Methods A total of 62 patients with liver cancer were divided into 2 groups.The inflow was occluded in group A (n = 28) and not occluded in group B (n = 34) during hepatectomy.Subsequently,the influence of the two approaches on the parameters including intraoperative blood loss,postoperative hepatic function and complications incidence rate was comparatively analyzed.Results Hepatectomy was successfully performed in the two groups.There was no significant difference between the two groups in intraoperative blood loss (P ＞ 0.05).Significant difference existed between the two groups in postoperative hepatic function and complications incidence rate (P ＜ 0.05).Conclusions The hemihepatectomy for hepatoma without inflow occlusion can reduce complications incidence rate and profit the recovery of postoperative hepatic function parameters.
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Objective To investigate the surgical strategy of recurrent rectuvaginal fistula. Methods Retrospectivly analyzed the clinical data of 13 patients with recurrent rectovaginal fistula from December 2001 to December 2008. The etiopathogenisis and the ways of treatment were analyzed. Results All the 13 patients with a transverse colostomy surgical repaired with Mason operation in the secondary intention,and recepted closure of colostomy in the third intention for treatment, all patients were cured. No recurrent fistula was identified with postoperative follow-up 4 - 84 months. Conclusions After recurrent rectovaginal fistula with multiple surgical treatment,the blood supply of local tissue is poor,the scar is serious. Selecting the appropriate timing of operation, adequate preoperative preparation, the application of transverse colostomy and Mason operation in different period could significantly enhance the successful operation rate.