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Post-pubertal Teratoma

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In post-pubertal teratomas, the surrounding testis is often atrophic and shows germ cell neoplasia-in-situ (GCNIS), hypospermatogenesis and microlithiasis. In mixed germ cell tumors, teratoma usually coexists with yolk sac tumor or embryonal carcinoma.

This image from a post-pubertal teratoma shows GCNIS with pagetoid involvement of rete testis.

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