A rare neoplasm, usually benign, derived from mesenchymal fibroblasts located in the submesothelial lining of the PLEURA. It spite of its various synonyms, it has no features of mesothelial cells and is not related to malignant MESOTHELIOMA or asbestos exposure. The disease is benign fibrous mesothelioma (Experimental Factor Ontology id EFO_1000835). Also known as: fibrous mesothelioma, benign, fibrous mesothelioma, benign (morphologic abnormality), localized benign fibrous mesothelioma.