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Eosinophils measure 10-17 microns in diameter, and have abundant, slightly basophilic cytoplasm containing numerous coarse, reddish-orange cytoplasmic granules.   Most eosinophils have bilobed nuclei, but occasional forms with trilobed nuclei may be seen.  The chromatin is condensed.   Eosinophils usually account for a minor subset of peripheral blood leukocytes.  Increased numbers of eosinophils can be seen in parasitic infections, allergic conditions, drug hypersensitivity, myeloid neoplasms, and lymphoproliferative disorders.