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Solitary fibrous tumor

solitary fibrous tumor, solitary fibrous tumor immunohistochemistry
Solitary fibrous tumor SFT, also known as fibrous tumor of the pleura, is a rare mesenchymal tumor originating in the pleura1 or at virtually any site in the soft tissue including seminal vesicle2 Approximately 78% to 88% of SFT's are benign and 12% to 22% are malignant3


  • 1 History
  • 2 Clinical Features
  • 3 Molecular biology
  • 4 Treatment and prognosis
  • 5 See also
  • 6 Additional images
  • 7 References
  • 8 External links


SFT was first mentioned in the scientific literature by Wagner4 The first discussion of its clinical and pathological properties was by Klemperer and Rabin35 SFTs have also been known as hemangiopericytomas although this term has now been discontinued from WHO tumor classifications

Over the years pleural SFTs acquired a number of synonyms, including localized fibrous tumor, benign mesothelioma, localized fibrous mesothelioma, submesothelial fibroma, and pleural fibroma The use of names that include ‘mesothelioma’ for this tumor is discouraged because of potential confusion with diffuse malignant mesothelioma, a much more serious disease1

This PA chest radiograph demonstrates an abnormal contour in the right hilar region, with visualization of the pulmonary vessels through the mass the hilar overlay sign indicating its posterior mediastinal location On resection this was found to be a benign solitary fibrous tumor of the pleura This axial CT image with intravenous contrast same patient as in the above chest radiograph reveals what appears to be a posterior mediastinal mass, which was surgically removed and found to be a solitary fibrous tumor of the pleura

Clinical Featuresedit

About 80% of pleural SFTs originate in the visceral pleura, while 20% arise from parietal pleura6 Although they are often very large tumors up to 40 cm in diameter, over half are asymptomatic at diagnosis6 While some researchers have proposed that a SFT occupying at least 40% of the affected hemithorax be considered a "giant solitary fibrous tumor",7 no such "giant" variant has yet been recognized within the most widely used pleural tumor classification scheme1

Some SFTs are associated with the paraneoplastic Doege–Potter syndrome, which is caused by tumor production of IGF-2

Molecular biologyedit

Recurrent somatic fusions of the two genes, NGFI-A–binding protein 2 NAB2 and STAT6, located at chromosomal region 12q13, have been identified in solitary fibrous tumors

Treatment and prognosisedit

The treatment of choice for both benign and malignant SFT is complete en bloc surgical resection

Prognosis in benign SFTs is excellent About 8% will recur after first resection, with the recurrence usually cured after additional surgery3

The prognosis in malignant SFTs is much more guarded Approximately 63% of patients will have a recurrence of their tumor, of which more than half will succumb to disease progression within 2 years3 Adjuvant chemotherapy and/or radiotherapy in malignant SFT remains controversial3

See alsoedit

  • Hemangiopericytoma
  • Myopericytoma

Additional imagesedit


  1. ^ a b c Travis WD, Brambilla E, Muller-Hermelink HK, Harris CC Eds: World Health Organization Classification of Tumours Pathology and Genetics of Tumours of the Lung, Pleura, Thymus and Heart IARC Press: Lyon 2004
  2. ^ "Radiology–pathology conference: malignant solitary fibrous tumor of the seminal vesicle" Clinical Imaging 37: 409–413 doi:101016/jclinimag201204027 
  3. ^ a b c d e Robinson LA Solitary fibrous tumor of the pleura Cancer Control 2006;13:264-9
  4. ^ Wagner E Das tuberkelahnliche lymphadenom der cytogene oder reticulirte tuberkel Arch Heilk Leipig 1870;11:497>
  5. ^ de Perrot M, Fischer S, Brundler MA, et al Solitary fibrous tumors of the pleura Ann Thorac Surg 2002;74:285-293
  6. ^ a b Briselli M, Mark EJ, Dickersin GR Solitary fibrous tumors of the pleura: eight new cases and review of 360 cases in the literature" Cancer 1981;47:2678-89
  7. ^ Pinedo-Onofre JA, Robles-Pérez E, Peña-Mirabal ES, Hernández-Carrillo JA, Téllez-Becerra JL Giant solitary fibrous tumor of the pleura Cir Cir 2010;78:31-43 Article in Spanish

External linksedit

  • 1 World Health Organization Classification of Tumours Pathology and Genetics of Tumours of the Lung, Pleura, Thymus and Heart Download Page

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Solitary fibrous tumor

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