Mixed clinicopathologic behavior of a solitary mesothelioma

A large solitary mesothelioma was found to exhibit malignant features microscopically, but benign characteristics grossly, including a surgically curative resection. The mixed behavior of this tumor supports the evolving understanding of mesotheliomas as progeny of multipotential subserosal cells with capabilities of differentiating into several tissue types with varying degrees of anaplasia.