Peritonitis is defined as inflammation of the peritoneum. The inflammatory response involves vasodilation, exudation of protein-rich fluid, cellular infiltration, pain and, chronically, formation of fibrous adhesion. The disease can be classified into primary and secondary cases.
It begins in the venous plexus along the medial side of the foot, and it runs up the medial side of the leg and knee, alongside the saphenous nerve. In the thigh, the long saphenous vein continues up the medial surface, accompanying the medial femoral cutaneous nerve.
Great Saphenous Vein. The great saphenous vein is the major superficial vein of the medial leg and thigh. It is the longest vein in the human body, extending from the top of the foot to the upper thigh and groin. The great saphenous vein plays an important role in returning blood from the superficial tissues of the leg to the heart and is also used in several medical procedures due to its size and superficial location.