Lymphocoele of the thoracic duct: a cause of left supraclavicular fossa

Lymphocoele of the thoracic duct, alternatively referred to as thoracic duct cyst, is an uncommon abnormality that can present occasionally as a left supraclavicular fossa mass. Recognition of the origin of such a neck mass on imaging is crucial to avert unnecessary intervention. A case of such a mass is presented with discussion of the fascinating variable anatomy of the thoracic duct.