Solitary Fibrous Tumor of the Peritoneum Found in the Prevesical Space

Abstract

Solitary fibrous tumors (SFT) are well recognized in the pleura, but their rare occurrence at other sites has become appreciated only in recent years. We experienced a 68-year-old male patient who presented with frequency of urination and difficulty in voiding. Computed tomographic scan revealed a solid and cystic mass which measured 12 × 10 cm in the prevesical space. This tumor showed typical histopathologic features of SFT, and was immunostained positive for vimentin, CD34 and CD99. This is an extremely rare case of SFT arising from the parietal peritoneum found in the prevesical space.

Solitary Fibrous Tumour of Thyroid: Report of Two Cases with Immunohistochemical Features and Literature Review

“…However, reports of this tumour type occurring in other sites such as the mediastinum, pericardium, nasal cavity, peritoneum and liver are increasingly being described [2][3][4][5][6].…”

“…Its controversial histogenesis is reflected by the different nomenclature used to designate this tumour. It is uncertain if this tumour arises from mesothelial or mesenchymal cells, although the latter is now preferred [18,20] on the basis of immunohistochemical studies which identified the tumour cells with fibroblastic or myofibroblastic features as of mesenchymal origin [5,6].…”

“…It was initially described in the pleura by Klemperer and Rabin [1] as a form of localized fibrous mesothelioma. Subsequent studies have reported sporadic cases of SFT in various extrapleural sites, such as the mediastinum, pericardium, nasal cavity, peritoneum, retroperitoneum and liver have been increasing [2][3][4][5][6].…”

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“…In addition, CD34 and CD99 (O-13) have has been found to be the only other markers that have been consistently positive in the neoplasm [4,11,16]. Furthermore, SFTs have been negative for s-100 protein, desmin, and α-SMA, suggesting that SFTs originates from the mesenchyme rather than the overlaying mesothelium.…”

“…About 700 cases of SFTs were described from 1942; in 85-90% of cases they arose from the pleura, but have also been described in other locations in the body, including the pelvic cavity, nasal cavity, pulmonary parenchyma, meninges, kidney, lung, mediastinum, retroperitoneum, temporal region, neck, groin, buttock, and thigh [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16].…”