A review of the literature revealed 11 reported cases of primary malignant melanoma of the tongue. Melanoma metastatic to the tongue has been reported only seven times since 1912. Melanoma metastatic to the tongue from a primary tumor of the skin of the lower back occurred in a 41-year-old woman. The primary lesion had been excised 18 months prior to the discovery of this solitary metastasis.
Miller AS, Pullon PA. Metastatic Malignant Melanoma of the Tongue. Arch Dermatol. 1971;103(2):201-205. doi:10.1001/archderm.1971.04000140087016