PMC3969645_01
(a) Inner layer of muscle are arranged circumferentially around vessels and outer layer blends with less well-ordered smooth muscle tissue of tumor. (H and E, x40) (b) Islands of lipometaplasia within the tumor. (H and E, x40) (c) Diffuse cytoplasmic positivity present in tumor cells for smooth muscle actin. (x100) (d) CD34 positivity seen only in endothelial cell of vessel wall. (x40)
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F1
The vessels were surrounded by an inner layer of muscle arranged circumferentially and outer layer blending with the less ordered tumor cells [Figure 1a]. Islands showing lipometaplasia were also observed among tumor cells [Figure 1b]. On immunohistochemistry, these tumor cells were diffusely positivity for Smooth Muscle Actin (SMA) [Figure 1c] and endothelial cells lining the vascular spaces were positive for CD34 [Figure 1d].