Extrathoracic solitary fibrous tumor of the pelvic peritoneum with central malignant degeneration on CT and MRI

Abstract

We describe a 61-year-old man who presented with an extrathoracic solitary fibrous tumor (SFT) of the pelvic peritoneum with central malignant degeneration as seen on computed tomography (CT), magnetic resonance imaging (MRI), and histopathology. When a central focus of heterogeneity and variable contrast enhancement are identified within a fibrous tumor of the pelvis on CT or MRI, malignant degeneration of an extrathoracic SFT, although rare, should be considered as a diagnostic possibility.

Myxoid Solitary Fibrous Tumor of the Retroperitoneum: MRI Findings with the Pathologic Correlation

“…The linear or curvilinear hypointense lines on MR images that were noted in our case can be attributed to the collagenous stroma (7). Intense enhancement after intravenous gadolinium injection has been reported to be due to the high vascularity of SFTs (2, 7, 8). In fact, the large majority of lesions that have been classified as hemangiopericytoma, which shows an architectural hypervascular pattern, essentially represent SFTs because they show no evidence of pericytic differentiation and instead, they appear to be fibroblastic in nature (1).…”

“…It was originally described as a serosa-associated tumor in the pleura, but they are currently known to occur in a variety of extrapleural sites, including the retroperitoneum (1). Although extrapleural SFTs show variable signal intensity depending on the differences in the main components of the tumor, they are usually visualized as a heterogeneous hypointensity on T2-weighted images (2, 3). To the best of our knowledge, only a few cases of myxoid SFT that have shown high signal intensity on T2-weighted images have been reported in the literature (4, 5).…”

Solitary fibrous tumor of the pleura: Apparent diffusion coefficient (ADC) value and ADC map to predict malignant transformation

“…SOLITARY FIBROUS TUMORS (SFTs) are rare neoplasms of mesenchymal origin that account for less than 2% of all soft‐tissue tumors, with the majority of SFTs arising from the pleura (1–4). Most SFTs are histologically benign, but up to 20% of SFTs may be malignant (1, 2).…”

Solitary Fibrous Tumor made Resectable after Successful Endovascular Embolization

“…The clinical symptomatology is depedent on the size and [9]. The incidence of recurrence and metastasis ranges from 11% to 15% [6,[10][11][12]. In view of this risk, patients who undergo surgical excision are followed up [3,7].…”