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Eosinophils are a normal cellular component of the blood and also of certain tissues, including spleen, lymph nodes, thymus, and the submucosal areas of the gastrointestinal, respiratory, and genitourinary tracts. Counts of 0 to 450 eosinophils per cubic millimeter of blood are considered within normal limits. Eosinophilic disorders occur when eosinophils are found in above-normal amounts in various parts of the body.
When the body wants to attack a substance, such as an allergy-triggering food or airborne allergen, eosinophils respond by moving into the area and releasing a variety of toxins. However, when the body produces too many eosinophils, they can cause chronic inflammation resulting in tissue damage. Eosinophilic disorders are diagnosed according to the location where the levels of eosinophils are elevated:
There are many disorders where eosinophils have been found elevated in the blood or in different tissues. General categories of disease, each with examples of those that have increased levels of eosinophils, range from allergic disorders to endocrine disorders.
Allergic disorders are classically characterized by the presence of eosinophils. Allergic rhinoconjunctivitis (hay fever) has increased levels of eosinophils in the nasal mucosa. Asthma, after an exacerbation, shows increased numbers of eosinophils in the lung.
Any drug / medicine has the potential to cause a reaction. Some of these reactions are allergic in nature, and eosinophils might be elevated in blood or in tissues where the drug is concentrated.
Parasitic infections (helminthiasis − worms), fungal infections and some other types of infections are associated with increased numbers of eosinophils.
Hematologic disorders with increased levels of eosinophils include hypereosinophilic syndrome, leukemias, lymphomas, tumors, mastocytosis, and atheroembolic disease.
Hyper-IgE syndrome, Omenn's syndrome, thymomas, and transplant rejections are only a few types of conditions with increased numbers of eosinophils.
Hypoadrenalism has been associated with increases in the levels of eosinophils in the blood.
There are certain conditions where eosinophils have been found to be increased or pathologically present. Expand the following categories for specific examples:
Atopic dermatitis (eczema), bullous pemphigoid, pemphigus vulgaris, dermatitis herpetiformis, drug-induced lesions, urticaria, eosinophilic panniculitis, angioedema with eosinophilia, Kimura's disease, Shulman's syndrome, Well's syndrome, eosinophilic ulcer of the oral mucosa, eosinophilic pustular folliculitis, and recurrent cutaneous necrotizing eosinophilic vasculitis.
Drug / toxin-induced eosinophilic lung disease, Loeffler's syndrome, allergic bronchopulmonary aspergillosis, eosinophilic pneumonia, Churg-Strauss syndrome, eosinophilic granuloma, and pleural eosinophilia.
Gastroesophageal reflux, parasitic infections, fungal infections, Helicobacter pylori infections, inflammatory bowel disease (ulcerative colitis and Crohn's disease), food allergic disorders, protein-induced enteropathy and protein-induced enterocolitis, allergic colitis, celiac disease, pemphigus vegetans (MR) and primary eosinophilic esophagitis, gastroenteritis, and colitis. Rare tumors (leiomyomatosis), connective tissue disorders, and vasculitic disorders.
Organizing chronic subdural hematoma membranes, central nervous system infections, ventriculoperitoneal shunts, and drug-induced adverse reactions.
Secondary to systemic disorders such as the hypereosinophilic syndrome or the Churg-Strauss syndrome, heart damage has been reported. Certain congenital heart conditions (septal defects, aortic stenosis) are associated with increased levels of eosinophils in the blood.
Eosinophiluria (eosinophils in the urine) is associated with infections or interstitial nephritis and eosinophilic cystitis.
This bone marrow is literally packed with eosinophils.
This bone marrow is literally packed with eosinophils. This appearance is characteristic of hypereosinophilic syndrome.
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