Intratubular germ cell neoplasia (ITGCN) with p53 and PCNA expression and adjacent mature teratoma in an infant testis. An immunohistochemical and morphologic study with a review of the literature.

Intratubular germ cell neoplasia (ITGCN) and mature teratoma of the testis are uncommon findings in children. We report a case of a 3-year-old boy with both ITGCN and mature teratoma--a unique finding in our experience. Immunohistochemical markers, including placental alkaline phosphatase (PLAP), 43-9F, p53, and proliferating cell nuclear antigen (PCNA), as well as the periodic acid-Schiff (PAS) stain, were applied to the ITGCN. PLAP and 43-9F were not detected, whereas p53 and PCNA nuclear expression was detected in approximately 5% of atypical germ cells. Abundant clumped intracytoplasmic glycogen deposits were identified within atypical germ cells. Our findings indicate that both PCNA and p53, in addition to a PAS stain, may be useful markers in detecting malignant intratubular germ cells.