Can you describe a pulmonary embolism and how it develops in a right leg?

A pulmonary embolism is a formed clot developing in the thrombyles of the veinous return. This clotting disengages the vital stop valves in the legs, which prevent veinous return from receeding backwards.

When it is clotted, the embolism may travel to the heart, resulting in cardiac failure and/or pulmonary distressm and failure.

This is an urgent medical condition and requires prompt medical attention for life to be maintained.