Papillary thyroid cancer in struma testis with malignant transformation in the lung associated with trisomy 17 successfully treated with total thyroidectomy and radioiodine ablation.

Background: Struma testis is a rare entity, and there are only few reports on the malignant transformation of a testicular teratoma to papillary thyroid carcinoma in the literature. In this report, we describe the malignant transformation of struma testis with distant lung metastasis associated with trisomy 17 and a coexisting papillary microcarcinoma in the thyroid.

Case Report: A 56-year-old man presented after a left orchiectomy for an undescended left testicle.