What are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders, where a disease of the eye in response to changes in the vitreous humor or more rarely, diabetes, that causes the cells response?
White blood cell White blood cells (WBCs), also called leukocytes or leucocytes, are the cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All white blood cells are produced and derived from multipotent cells in the bone marrow known as hematopoietic stem cells. Leukocytes are found throughout the body, including the blood and lymphatic system.
Leukostasis Leukostasis is an extreme form of leukocytosis (an excess of white blood cells) that is dangerously symptomatic. It is therefore also called symptomatic hyperleukocytosis. It is a white blood cell count above 100,000/μL. It is characterized by abnormal intravascular leukocyte aggregation and clumping. It is most often seen in leukemia patients. The brain and lungs are the two most commonly affected organs. Occluded microcirculation causes local hypoxemia and hemorrhage manifesting as headache, blurred vision, transient ischemic attacks, cerebrovascular accidents and dyspnea. It is an acute syndrome requiring aggressive cytoreductive modalities including chemotherapy and/or leukapheresis to both reduce the number of circulating leukocytes and to break apart any aggregates that have already formed. Such rapid and massive lysis of tissue poses risk of complications (tumor lysis syndrome), but it is necessary to avoid stroke.