Biopsy of a purple mass in the tongue of a 67-year-old man showed numerous vascular channels lined by benign endothelial cells. The lesion was not encapsulated, and the vascular channels were filled with blood. This is a description of a:

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This description is characteristic of a vascular malformation, which is a benign lesion consisting of numerous vascular channels lined by benign endothelial cells, often not encapsulated and filled with blood.

Biopsy of a Purple Mass in the Tongue of a 67-Year-Old