Churg-Strauss syndrome associated with montelukast

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Abstract
Churg-Strauss syndrome (CSS) has recently been reported in patients with asthma receiving leukotriene receptor antagonists (LTRAs). In this paper a case of CSS after treatment with montelukast is described. As in other LTRA treated cases, prior withdrawal of maintenance oral steroid may have unmasked a previously occult CSS in the patient, but a dramatic improvement in his eosinophilia after withdrawing montelukast implied that the drug also had a direct effect in activating this condition.