Publication date: Available online 3 March 2018
Source:Annals of Anatomy - Anatomischer Anzeiger
Author(s): Ingmar L. Defize, Bernadette Schurink, Teus J. Weijs, Tom A.P. Roeling, Jelle P. Ruurda, Richard van Hillegersberg, Ronald L.A.W. Bleys
BackgroundInjury and subsequent leakage of unrecognized thoracic duct tributaries during transthoracic esophagectomy may lead to chylothorax. Therefore, we hypothesized that thoracic duct anatomy at the diaphragm is more complex than currently recognized and aimed to provide a detailed description of the anatomy of the thoracic duct at the diaphragm.Basic proceduresThe thoracic duct and its tributaries were dissected in 7 (2 male and 5 female) embalmed human cadavers. The level of origin of the thoracic duct and the points where tributaries entered the thoracic duct were measured using landmarks easily identified during surgery: the aortic and esophageal hiatus and the arch of the azygos vein.Main findingsThe thoracic duct was formed in the thoracic cavity by the union of multiple abdominal tributaries in 6 cadavers. In 3 cadavers partially duplicated systems were present that communicated with interductal branches. The thoracic duct was formed by a median of 3 (IQR: 3–5) abdominal tributaries merging 8.3 centimeters (IQR: 7.3–9.3cm) above the aortic hiatus, 1.8 centimeters (IQR: −0.4–2.4cm) above the esophageal hiatus, and 12.3 centimeters (IQR: 14.0–−11.0cm) below the arch of the azygos vein.ConclusionThis study challenges the paradigm that abdominal lymphatics join in the abdomen to pass the diaphragm as a single thoracic duct. In this study, this occurred in 1/7 cadavers. Although small, the results of this series suggest that the formation of the thoracic duct above the diaphragm is more common than previously thought. This knowledge may be vital to prevent and treat post-operative chyle leakage.
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