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Journal of Case Reports
Solitary Fibrous Tumor of Retroperitoneum: An Unusual Localisation of an Uncommon Neoplasm
Álvarez L Jiménez1, Alonso M Díez1, Martín A Blázquez1, Corral C Díez2, D Miminas3
Departments of 1General and Digestive Surgery and 2Pathology, Príncipe de Asturias University Hospital. Alcalá de Henares. Madrid, Spain; 3Department of Plastic and Reconstructive Surgery, Valles Hospital, Alcala de Henares. Madrid, Spain.
Corresponding Author:
Dr. Jiménez Álvarez L
Email: laura.jimenezal@gmail.com
Received: 22-DEC-2018 Accepted: 20-AUG-2019 Published Online: 05-OCT-2019
DOI: http://dx.doi.org/10.17659/01.2019.0054
Abstract
Background: The solitary fibrous tumor (SFT) is a soft tissue tumor of fibroblastic origin. Most of the times, it develops in the thorax. Very infrequently, it appears in other locations such as the retroperitoneum or pelvis. Most cases have benign behavior, characterized by a slow localized growth, but 10-20% of cases are locally aggressive or metastasize in distant locations. Case Report: We present a case of extra-pleural SFT, in an unusual location, at the mesorectum. It reached 8 cm maximal diameter, and was accompanied by macroscopic traits of local malignancy. Histopathological examination and immunohistochemistry revealed a mesenchymal fusocellular/spindle cell tumor.  Conclusion: Although an uncommon mesenchymal neoplasia, SFT should be kept in mind when making the differential diagnosis of pelvic masses. It should be considered as a neoplasm with a high risk of local recurrence or metastasis.
Keywords : Mitotic Index, Soft Tissue Neoplasms, Solitary Fibrous Tumors, Pelvis, Thorax.
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