Solitary Fibrous Tumor of the Hypoglossal Nerve
Ma Lourdes S. Badiona,
C. C. Tchoyoson Lima,
Jennifer Teoc,
Peck Leong Ongb and
Francis Huia
a Departments of Neuroradiology, National Neuroscience Institute, Singapore
b Neurosurgery, National Neuroscience Institute, Singapore
c Department of Pathology, Singapore General Hospital, Singapore
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FIG 1. Axial CT scan of the skull base shows smooth, well-defined widening of the left hypoglossal canal (arrow). No bony destruction is demonstrated.
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FIG 2. Axial MR images.
A, T1-weighted image reveals a well-circumscribed, elongated tumor occupying the hypoglossal canal (arrow). The T1 signal intensity is homogeneously isointense relative to gray matter.
B, On the corresponding T2-weighted image, the mass is also uniformly isointense relative to gray matter.
C, After the intravenous injection of contrast material, homogeneous enhancement of the tumor is observed.
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FIG 3. Uniform spindle cells are arranged in fascicles with thin bands of intercellular collagen (hematoxylin-eosin stain, original magnification x100).
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FIG 4. Tumor cells (arrow) stain positively for CD34. (original magnification x200).
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