The results revealed a malignant transformation of the teratoma, with the presence of a poorly differentiated, invasive melanoma (Vim+, Melan-A+, S100−, and CD117−), accompanied by numerous melanophages (IBA1+) in the surrounding tissue and inguinal lymph nodes, and a concomitant metastatic carcinoma (PCK+), which was identified in the iliac lymph node of undetermined origin. This evidence concerns the gene KIT and metastatic carcinoma.