Low-grade serous carcinoma (mullerian/ovarian type) of the paratestis presenting as diffuse metastatic disease of unknown origin: Case report of an uncommon tumor with an unusual presentation

An unusual case of a tibial metastasis as the first clinical presentation of a serous papillary carcinoma of the ovarian epithelial type of the testis

Among testicular neoplasms, ovarian-type epithelial tumors constitute an exceedingly rare group, with only a few cases reported in the literature. We describe the case of an 82-year-old man, presented with complaints of right leg pain and difficulty walking, who was found to have a large right tibial metastasis of unknown primary origin. Whole body CT scan did not reveal any cranial, thoracic or abdominal tumor masses, but it showed abnormal para-aortic lymph nodes and right spermatic cord swelling. An extemporary ultrasound examination found a right testicular mass. The patient underwent radical orchiectomy, and the diagnosis of a serous papillary carcinoma of the ovarian epithelial type of the testis was made. To the best of our knowledge, this is the first case in the literature of isolated bone metastasis from ovarian-type epithelial tumor of testis.