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De Perrot classification of malignant potential of pleural solitary fibrous tumors

Stage	Definition	Risk of recurrence, %
0	Pedunculated tumor without histologic signs of malignancy*	2
I	Sessile or "inverted" tumor without histologic signs of malignancy*	8
II	Pedunculated tumor with histologic signs of malignancy*	14
III	Sessile or "inverted" tumor with histologic signs of malignancy*	63
IV	Multiple synchronous metastatic tumors

* Malignant behavior is suggested by the presence of the following histologic features: high cellularity with crowding and overlapping of nuclei, cellular pleomorphism, high mitotic count (more than 4 per 10 high-power fields), necrosis, or stromal/vascular invasion.

Original figure modified for this publication. de Perrot M, Fischer S, Bründler MA, et al. Solitary Fibrous Tumors of the Pleura. Ann Thorac Surg 2002; 74:285. Table used with the permission of Elsevier Inc. All rights reserved.

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