Immunohistochemical phenotypes of histioeosinophilic granulomas of thymus and reactive eosinophilic pleuritis.

Immunohistochemical phenotyping of 7 cases of histioeosinophilic granulomas of thymus and 4 cases of reactive eosinophilic pleuritis was performed. All 11 cases of these 2 entities reacted identically. This supports the view that these 2 lesions are similar in nature. Both lesions are reactions to the presence of insufflated gas and its resorption.