Squamous Cell Carcinoma Arising in a Testicular Teratoma and Presenting as Sister Mary Joseph Nodule

The most common somatic type malignancy arising in patients with testicular germ cell tumors (GCTs) is sarcoma. Development of carcinomas, especially squamous cell carcinoma is an extremely rare event. Most cases of metastatic umbilical nodules (Sister Mary Joseph nodule) develop from adenocarcinomas. Fifteen percent of such cases have unknown origin; but development from a testicular squamous cell carcinoma has not yet been reported in the literature. We report a rare case of somatic type squamous cell carcinoma arising in a testicular teratoma. It is also possibly the first reported case of its kind which presented with a metastatic umbilical nodule. This possibility should be kept in mind while evaluating metastatic umbilical nodules in young male patients.