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.
The accessory saphenous vein is linked to the greater saphenous vein, which runs parallel to it, and is located in the leg and thigh. The greater saphenous vein is a large superficial (near the skinâs surface) vein that originates where the foot's dorsal venous arch merges with the big toe's dorsal vein. It travels up the leg's medial side (closer to the middle) after passing anteriorly to the medial malleolus, a bony projection on the inside of each ankle.