Abstract
This report describes three cases of intrapulmonary fibromas which are histologically identical to localized fibrous tumors of pleura (localized fibrous mesothelioma). Morphologically these tumors are characterized by a haphazard proliferation of cytologically bland spindle cells separated by variable amounts of wavy hyalinized collagen. Entrapped bronchiolar and alveolar epithelium is common. These spindle cells lack expression of cytoplasmic keratin, S-100 protein, desmin, and epithelial membrane antigen, but are strongly decorated for intracellular vimentin. The clinical behavior, differential diagnosis, and histogenesis of these lesions are discussed.
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