Scattini, C. M. and Orsi, A. (1973). Thorax, 28,[782][783][784][785][786][787] Multiple bilateral fibromas of the pleura. A patient with multiple bilateral fibromas of the pleura which evolved over 25 years is presented. Tumours were resected in four successive surgical interventions during this period. At the second operation 'spontaneous regression' of several small pleural fibromas noted at the first operation four years previously was observed. The differentiation between pleural fibroma and pleural localized mesothelioma is discussed.