Malignant Transformation in a Mature Testicular Teratoma Left Untreated for more than 50 Years Since Childhood.

Although testicular teratoma in childhood is regarded as a benign tumor, little is known about the consequences of pediatric teratoma being left untreated. We report herein a case of malignant transformation observed in a mature testicular teratoma that was presumed to have remained benign for >50 years. [ABSTRACT FROM AUTHOR]