Eosinophilic polymyositis presenting as a pseudotumour in the hypereosinophilic syndrome.

This report describes an unusual case of pseudotumour of muscle caused by an eosinophilic myositis associated with peripheral blood eosinophilia, systemic illness and a pericardial effusion. The relationship of this case to other reported cases of eosinophilic myositis and the hypereosinophilic syndrome is discussed briefly.