Laparoscopic cholecystectomy is one of the most common procedures performed worldwide. Despite advances in technique, injury to the common bile duct and blood vessels still occurs. Rouviere's sulcus, a naturally occurring cleft in the right lobe, anterior to Segment 1, occurs in over 80% of normal livers. It is a useful, but often ignored, anatomical landmark for beginning dissection of Calot's triangle, and also for confirming its location. Despite this, its usefulness is not widely known or appreciated by general surgeons. This article discusses the critical aspects of incorporating this useful landmark in safe laparoscopic surgery, including pitfalls, where the landmark may not be present or misleading. The useful mnemonic of "RANGERS"- Rouviere's At Neck of Gallbladder Eases Recognition of Structures, helps draw attention to the sulcus to facilitate safer laparoscopic cholecystectomy.

Background: Improving our understanding of social inequalities may improve prevention and treatment efforts for diabetes mellitus. We examined the association between individual-and area-level socioeconomic measures and physician-diagnosed diabetes in Saskatchewan over time. Methods: In this cross-sectional study, we linked health administrative data with individual-level socioeconomic data from the Canadian Community Health Survey and area-level data from the 2006 Canadian census. We used general linear mixed-models regression to analyze the effect of each factor, controlling for geographic and demographic measures. Results: Area-level deprivation was associated with medically diagnosed type 2 diabetes mellitus after adjustment for the individuallevel factors of age, sex, household income and education. Individuals residing in areas ranked in the least deprived quintile had a lower likelihood of diabetes than those in the most deprived quintile (odds ratio 0.40, 95% confidence interval 0.18-0.88). However, this disparity existed only in urban areas. This result may reflect less pronounced health inequalities in rural areas, greater socioeconomic heterogeneity, larger geographic units or some combination of these factors. Interpretation: Individual-and area-level socioeconomic factors were associated with the likelihood of medically diagnosed diabetes; however, the strength of this association varied between urban and rural communities. Acknowledgement of area-level deprivation as a modifiable risk factor related to the prevalence of diabetes is important in the development of effective interventions for urban, but not rural, areas.

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