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AJNR - American Journal of Neuroradiology

Published ahead of print on February 13, 2008
doi: 10.3174/ajnr.A0961

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Solitary Fibrous Tumor of the Orbit: CT and MR Imaging Findings

H.J Kim^a, H.-J. Kim^a, Y.-D. Kim^b, Y.J. Yim^a, S.T. Kim^a, P. Jeon^a, K.H. Kim^a, H.S. Byun^a and H.J. Song^c

^a From the Departments of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
^b Ophthalmology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
^c Pathology; Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea

View larger version (103K): [in this window] [in a new window]   Fig 1. A–I, Case 2. Solitary fibrous tumor of the orbit in a 50-year-old woman. Axial precontrast (A), early-phase (B), late-phase (C), and delayed coronal (D) CT scans show a 30-mm well-defined soft tissue mass in the superolateral aspect of the right orbit near the lacrimal gland fossa. Compared with the cerebral gray matter, the mass is slightly hyperattenuated on precontrast CT scan (A). Marked homogeneous enhancement is seen on early-phase CT scan (B), and there is rapid washout of contrast material on late-phase (C) and delayed coronal (D) CT scans. The mass abuts and conforms to the posterior wall of the eyeball without causing significant indentation. E, Time-attenuation curve also reveals rapid enhancement and early washout of contrast material within the tumor (•), which is very similar to those of the internal carotid artery (x). = internal jugular vein. = medial rectus muscle. F–H, Compared with the cerebral gray matter, the mass is isointense and mixed isointense and hyperintense on axial T1- (F) and T2-weighted (G) MR images, respectively. Marked homogeneous enhancement is seen on coronal postcontrast T1-weighted MR image (H). Note the small areas of bright signal intensity within the tumor on T2-weighted image (G). I, Photomicrograph shows that the tumor has a patternless histologic architecture with hyalinized collagen bundles and multiple dilated vessels (hematoxylin-eosin, original magnification x40).

View larger version (69K): [in this window] [in a new window]   Fig 2. A–D, Case 5. Solitary fibrous tumor of the orbit in a 24-year-old woman. Postcontrast (A) axial CT scan and axial T1-weighted (B), T2-weighted (C), and postcontrast fat-suppressed T1-weighted (D) MR images show a 18-mm well-defined ovoid soft tissue mass in the inferomedial aspect of the intraconal space of the left orbit. Like the tumor shown in Fig 1, the mass conforms to the ocular contour without causing significant indentation. Compared with the cerebral gray matter, the mass is slightly hyperattenuated on precontrast CT scan (not shown), isointense on T1-weighted MR image (B), and mixed isointense and hyperintense and T2-weighted MR image (C). There is marked homogeneous enhancement of the tumor on postcontrast CT (A) and MR (D) images. Note the signal intensity void, tubular vascular structures inside the tumor on MR images (arrows).

View larger version (59K): [in this window] [in a new window]   Fig 3. A and B, Case 6. Solitary fibrous tumor of the lower eyelid in a 40-year-old man. Axial early-phase (A) and late-phase (B) CT scans show a 20-mm well-defined ovoid soft tissue mass on the right lower eyelid. Marked homogeneous enhancement is seen on early-phase CT scan (A), followed by rapid washout of contrast material on late-phase CT scan (B).