An Austin as Lovely as a Tree

Enrique, a pre-med student, receives notification that his acceptance to medical school is on its way and he accepts an invitation to go on a cross-country trip with his buddy Javier. The pre-med borrows his sister’s car, a 2021 Aston Martin Vantage F1 Roadster, and promises that he will not break any  speed limits. Of course, this will not happen. As soon as they hit the road they turn on Highway Song and put the “pedal to the metal”, there is no turning back. Both students know that driving over 100 mph on country roads is not an ideal thing to do, but lots of fun, until it is not. A deer jumps in front of them and you know what comes next – they reflexively veer off the road and hit a tree.  Javier is thrown from the car and lands on a soft pile of straw, shaken but not stirred. Our aspiring med-tudent  is not so lucky; the Aston Martin met the tree head on and he felt a sharp blow to his chest from the steering wheel. Oh deer, the car crash did a number on his ride. Amazingly, Enrique is able to get out of the car and walk away, but now the issue becomes what to tell his sister? He avoids the confrontation by simply booking a trip to Spain to relax on the Costa Brava at a café he really enjoys in Cadaqués. That same afternoon he takes an overnight flight to Barcelona to think through what he will tell his sister. However, when he lands, Enrique notices that both feet, legs and even thighs are somewhat swollen, as well as his left hand, forearm and arm. His left cheek is also puffy. Remarkably, his right side of the body feels just fine. Based on this scenario, what structure was likely injured in the accident?

What is the location of the thoracic duct?