ANATOMY Â© 2004 The Medicine Publishing Company Ltd1ANAESTHESIA AND INTENSIVE CARE MEDICINE The sacrum is a large triangular bone formed from the five fused sacral vertebrae (Figure 1). Two rows of foramina on its dorsal and pelvic surfaces divide it into a median portion, the body and two lateral masses.
Edema or Ådema is an abnormal accumulation of fluid in the interstitium, located beneath the skin and in the cavities of the body, which can cause severe pain. Clinically, edema manifests as swelling. The amount of interstitial fluid is determined by the balance of fluid homeostasis; and the increased secretion of fluid into the interstitium, or the impaired removal of the fluid, can cause the condition. The word is from Greek Î¿á¼´Î´Î·Î¼Î± oÃ­dÄma meaning swelling.
Edema is a type of swelling caused by excess fluid becoming trapped in the tissues of the body. It typically affects extremities such as the hands, feet and ankles, but it also occurs in the arms and legs and can potentially affect any part of the body. Varicose veins may also be found when this is the cause of edema. 2  Lymph node problems: An inadequate lymphatic system leads to the lymph nodes being unable to properly drain excess fluid from tissues in the body, which could cause edema to occur.