PMC3929381_01
(a) MRI axial T1-weighted image showing an intermediate intensity mass on the subcutaneous layer of the volar-radial aspect of the forearm (arrow). (b) MRI coronal T2-weighted image showing a well-defined high signal mass that is especially prominent in the small vessel (arrow). (c) MRI sagittal image with contrast displaying a homogenous strong enhancement (arrow).
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fig1
The mass had intermediate intensity on T1-weighted images and displayed an inhomogeneous high signal on T2-weighted images and homogenous strong enhancement with contrast (Figure 1).
(a) Intraoperative gross photograph showing the focal area of tenderness, which was marked before incision. (b) An oval-shaped, well-encapsulated mass was exposed through careful dissection, and was identified to be lying in a branch of the cephalic vein.
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fig2
A dark-red, well-defined, and oval-shaped mass (diameter, 3 mm) was identified in a branch of the cephalic vein (Figure 2).
(a) Histopathology slide of the specimen with hematoxylin and eosin staining at 40x magnification shows glomus tumor cells adjacent to the vessel wall (asterisk). (b) The tumor consists of uniformly rounded cells with centrally located round nuclei, eosinophilic cytoplasm, and dilated capillary vessels (200x magnification). (c) The tumor glomus cells and the smooth muscle cells of the vein wall stained for smooth muscle actin.
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fig3
Immunohistochemical staining revealed that the tumor cells were positive for smooth muscle actin (Figure 3).