Korean J Radiol.  2008 Jun;9(3):279-282. 10.3348/kjr.2008.9.3.279.

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

• Shin SS
• Jeong YY
• Kang HK

• KMID: 1758463
• DOI: http://doi.org/10.3348/kjr.2008.9.3.279

Abstract

We report here on a case of solitary fibrous tumor of the retroperitoneum, and the tumor displayed a predominantly myxoid histology. A 56-year-old man presented with an incidentally detected retroperitoneal mass. On the MR images, the mass was observed as having iso-signal intensity on the T1-weighted images and high signal intensity on the fat-saturated T2-weighted images. The mass showed intense enhancement on the Gd-DTPA enhanced T1-weighted images. At surgery, a well-defined solid mass was found in the left retroperitoneum. The histological diagnosis was made as solitary fibrous tumor with a predominantly myxoid histology.

Keyword

Magnetic resonance (MR); Solitary fibrous tumor; Retroperitoneum

MeSH Terms

Humans
*Magnetic Resonance Imaging
Male
Middle Aged
Retroperitoneal Neoplasms/*diagnosis/pathology
Solitary Fibrous Tumors/*diagnosis/pathology

Figure

• 

  Fig. 1 56-year-old man presenting with incidentally detected retroperitoneal mass. A. Axial T1-weighted MR image shows well-defined, lobulated mass that is isointense to adjacent muscle (arrows). B. Axial T2-weighted MR image with fat saturation shows that mass is heterogeneously hyperintense to muscle. There are several hypointense streaks (arrows) within mass. C. Axial Gd-DTPA enhanced T1-weighted MR image demonstrates strong enhancement of mass that abuts on external iliac vessel and psoas muscle (arrows). D. Sectioned gross pathologic specimen demonstrates yellowish white cut surface with both soft myxoid areas (arrows) and rubbery fibrous areas. E. Photomicrograph shows elongated spindle cells dispersed in heterogeneous stromal matrix with myxoid areas (arrows) and collagenous areas (original magnification; Hematoxylin-Eosin staining, × 100). F. Immunohistochemical stain for CD 34. Tumor cells show diffuse strong reactivity for CD 34 (original magnification, × 100).

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