ANATOMICAL STUDY OF MESENTERIC VEINS AND THEIR VARIATIONS: A SYSTEMATIC REVIEW AND META-ANALYSIS
DOI:
https://doi.org/10.64671/ts.v25i1.113Keywords:
Anatomy, Mesenteric Veins, Meta-analysisAbstract
Anatomical variations (AV) are modifications in morphological features that do not imply functional impairment. Among the structures most affected by them are the blood vessels, of which the superior (SMV) and inferior (IMV) mesenteric veins stand out. In this study, we aimed to identify the prevalence of different AVs of SMV and IMV using a systematic review with meta-analysis. The steps taken followed the PRISMA guidelines, and the study protocol was registered and published on the PROSPERO platform (CRD42022336763). R-Studio was used for meta-analysis adopting the random distribution model. The chi-square test and the I-square test were used to investigate heterogeneity and its amplitude, respectively. After all the steps described in the protocol, ten articles were obtained for systematic review and three for meta-analysis. The IMV was a tributary of the splenic vein (SV) in 52% of the cases and the SV, the latter being anastomosing with the SMV to form the hepatic portal vein (HPV) (95% CI 0.38 – 067; X22 = 5.50, p= 0.06; I2=64%). In addition to this pattern, IMV was observed as a tributary of the SMV in 30% of the individuals (95% CI 0.22–0.40; X22= 3.02, p = 0.22; I2= 34%), and it may also be targeting a common confluence point along with the SMV, SV and the jejunal vein. Thus, this study identified the main destinations of mesenteric vessels, recognizing the prevalence of each of the different conformations that they presented.
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