12 岁拉布拉多混种犬唇与颊黏膜恶性黑色素瘤

Photograph of malignant melanoma of lip and buccal mucosa in a 12-year-old Labrador Retriever mix. This mucocutaneous malignant melanoma appeared rapidly and exhibited a papillated surface. It was pedunculated, with a wide base involving the buccal mucosa.