PMC3880822_01
Histology (H and E stain x 40): Spindle cell proliferation with vascular channels infiltrating a colonic mucosa
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Histologic examination of polypoid lesions showed fusocellular spindle cells proliferation with a slit like vascular channels and extravased red blood cells consistent with the diagnosis of KS, associated with typical features of UC (Figure 1).
HHV8 immunohistochemical stain: strong nuclear positivity in spindle tumor cells x200
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Immunolabelling for HHV8 stained the nuclei of the spindle cells (Figure 2, Figure 3).
Fig CD31 immunohistochemical stain: positivity in vascular channels x40
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Immunolabelling for HHV8 stained the nuclei of the spindle cells (Figure 2, Figure 3).