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Eosinophilia is a condition in which the eosinophil count in the peripheral blood exceeds 5 × 10 8 /L (500/μL). [1] Hypereosinophilia is an elevation in an individual's circulating blood eosinophil count above 1.5 × 10 9 /L (i.e. 1,500/μL).
Eosinophil under the microscope (400×) from a peripheral blood smear. ... perhaps the most common cause for eosinophilia is an allergic condition such as asthma.
Hypereosinophilic syndrome is a disease characterized by a persistently elevated eosinophil count (≥ 1500 eosinophils/mm³) in the blood for at least six months without any recognizable cause, with involvement of either the heart, nervous system, or bone marrow.
Angiolymphoid hyperplasia with eosinophilia is characterized by papulonodular lesions on the head and neck that are violaceous or erythematous. [5] Lesions on the genital area, upper limbs, and trunk are uncommon. The lesions could be painful, pruriginous, or asymptomatic. Peripheral eosinophilia and lymphadenomegaly could be present. [6]
Eosinophils are also the predominant inflammatory cells in allergic reactions. The most important causes of eosinophilia include allergies such as asthma, hay fever, and hives; and parasitic infections. They secrete chemicals that destroy large parasites, such as hookworms and tapeworms, that are too big for any one white blood cell to phagocytize.
Parasites cause eosinophilic pneumonia in three different ways. Parasites can either invade the lungs, live in the lungs as part of their life cycle, or be spread to the lungs by the bloodstream. Eosinophils then migrate to the lungs in order to fight the parasites, and cause eosinophilic pneumonia when they release their contents.
Tropical pulmonary eosinophilia is a rare syndrome characterised by pulmonary interstitial infiltrates and marked peripheral eosinophilia. [2] This condition is more widely recognised and promptly diagnosed in filariasis-endemic regions, such as the Indian subcontinent, Africa, Asia and South America.
Lymphocyte-variant hypereosinophilia is a rare disorder in which eosinophilia or hypereosinophilia (i.e. a large or extremely large increase in the number of eosinophils in the blood circulation) is caused by an aberrant population of lymphocytes.