To summarize, the results confirm somatic-type malignant transformation of a testicular teratoma to melanoma based on the detection of a poorly differentiated, hypomelanotic, invasive melanoma (Vim+, MelanA+, S100−, and CD117−), accompanied by numerous melanophages (IBA1+) in the surrounding tissue and inguinal lymph nodes. This evidence concerns the gene KIT and melanoma.