Charcot-Leyden Crystals

Charcot-Leyden crystals — fecal smear (trichrome stain, oil immersion). These crystals are formed from the breakdown products of eosinophils and indicate the presence of a non-specific immune response in the patient. The crystals may be present in a parasitic infection (primarily helminths) or in allergic conditions unrelated to a specific etiologic agent.