Identification of An Etiologic Agent by Ultrastructural Evaluation of an Ulcerated Intraoral Nodule 

Light Microscopy

Figure 2. A spindle cell lesion with vascular channels.
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Figure 3. Spindle cell lesion; occasional vascular channels with intraluminal erythrocytes.
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Figure 4. Spindle cells in a nodular pattern with some
cleft-like vascular spaces.
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