Charcot-Leyden crystals
Charcot-Leyden crystals consist of collections of bipyramidal crystalloid made up of eosinophillic membrane proteins
They occur in
- asthma
- other eosinophilic lung disease 2
- certain cases of sinusitis (e.g. allergic fungal sinusitis)
They may be detected in the sputum or sinus secretions with these conditions.

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