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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).
