FIGURE 1.

A 74-year-old man with malignant solitary fibrous tumor of the pleura with malignant characteristics, who presented a gradually enlarged pleural mass and subsequent brain metastasis. A and B, Enhanced chest CT transverse and coronal images of the mediastinal window at the right and left atrium levels, respectively, showing a bulky, lobulated, heterogeneously enhancing mass involving the right hemi-diaphragm, displacing the heart and right lower lobe, and mimicking sarcoma. Not an indistinct fat plan of the diaphragm and liver dome. C, Whole-body ¹⁸F-fluorodeoxyglucose positron emission tomography CT transverse image showing mild hypermetabolism (maxSUV: 3.3). D, The patient had undergone pleural mass excision and right lower lobectomy. The mass did not involve lung parenchyma but the diaphragm. Photograph of a tumor showing a lobulating margin. E, Photomicrograph of the histologic specimen showing a 23/10 high-power-field mitosis and no lymphovascular invasion. Note the nuclear pleomorphism, which may also characterize a malignant fibrous tumor of the pleura (hematoxylin and eosin stain, ×200).