The histology of an adult testicular GCT often resembles normal granulosa cell tissue morphology, with similar immunohistochemical staining pattern such as positivity for steroidogenic factor 1 (SF1), calretinin, and inhibin A.<sup>4,5</sup> We present a case of a 39-year-old male with an adult GCT of the testicle who underwent successful unilateral orchiectomy. The gene discussed is SF1; the disease is granular cell tumor.