PMC2728605_01
Endoscopic images of the tumor ( ) in the right nasal cavity viewed from the superior (a) and inferior (b) directions. The base of the tumor is seen in the lateral wall of the ostium of the sphenoid sinus (*). ST: superior turbinate, IT: inferior turbinate, NS: nasal septum.
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Nasal endoscopy revealed a pinkish tumor arising from the ostium of the right sphenoid sinus and extending to the right nasal cavity and epipharynx (Figures 1(a) and 1(b)). 
T1- (a) and T2-weighted (b) magnetic resonance (MR) images of the tumor ( ). Gd-enhanced sagittal MR image (c) revealed that the tumor originated in the right sphenoid sinus (SS).
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T1-weighted images (Figure 2(a)) and heterogeneous hypo-and hyperintense signals on T2-weighted images (Figure 2(b)). The mass showed prominent and inhomogeneous enhancement with gadolinium and was also revealed to be originated from the right sphenoid sinus (Figure 2(c)). 
Macroscopic features of the excised tumor.
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The tumor was successfully resected "en bloc" and was removed through the oral cavity (Figure 3).
Histopathological features of the tumor. (a) the spindle cells are arranged in a patternless fashion in the collagenous matrix on hematoxylin-eosin staining (x200). (b) the vast majority of the tumor cells were stained diffusely and strongly for CD34 (x400). (c) cytoplasm in the numerous tumor cells expressed the Bcl-2 (x400).
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Histopathological examination of the tumor revealed the spindle cells showing a patternless arrangement within the collagenous matrix and numerous thick-walled vessels with dilated vascular spaces (Figure 4(a)). Immunohistochemically, the tumor cells were stained positively for CD34 (Figure 4(b)) and Bcl-2 (Figure 4(c)), but were not stained for S-100 proteinor c-kit; thus, a diagnosis of SFT was established.