[Fraggle]

Bruce at AS also suggested the possibility of puncturing the lymphatic system. This network of vessels flows through the body returning interstitial cellular fluid back into blood plasma. It uses skeletal muscles as it's 'pump' with many one way valves to prevent reverse flow. The clear fluid that flows through the system is referred to as lymph -- hence the name.

The fluid flows from the lymph capillaries in the far extremities into the lymph vessels and then the thoracic ducts before returning into the blood vessels. The large vessels, particularly the ducts are in highly protected areas such as adjacent to the spinal column. There is some slight risk of puncturing a lymph vessel in either the thigh or gluteal muscles. If you do inject into a lymphatic vessel, you could experience some swelling at the site. This will not diminish functionality of the steroid as the lymph system is one of the primary methods the body uses for transport of 'fatty acids' and oils.

The best way to determine if you have punctured one is the same for blood vessel puncture. Aspirate. Instead of looking for red blood, you are looking for clear fluid return. In either case, withdraw the needle and attempt to inject at another location. Significant pain is unlikely as the vessel is not under pressure, but better safe then sorry.

Fraggle