Bone where it should not be: an unusual case of paratesticular osseous metaplasia

Paratesticular osseous metaplasia is an exceptionally rare benign condition characterized by ectopic bone formation within paratesticular tissues, such as the epididymis or spermatic cord. The exact cause remains uncertain, but chronic inflammation, tissue injury, or degenerative changes have been suggested as possible triggers. We report a case of a 50-year-old male presenting with a firm, painless, slow-growing scrotal mass of two years’ duration. There was no history of trauma, surgery, or systemic illness. Ultrasonography revealed bilateral scrotal masses, and bilateral orchidectomy was performed. Grossly, both testes were unremarkable; however, firm, gritty, whitish areas were identified in the paratesticular region near the epididymis. Microscopy showed mature bone trabeculae formation within the epididymal tissue without any associated neoplastic component. This case highlights the importance of considering osseous metaplasia in the differential diagnosis of calcified or ossified scrotal masses. A thorough histopathological evaluation remains essential for accurate diagnosis and to distinguish it from neoplastic conditions such as teratoma or extraskeletal osteosarcoma. Awareness of this rare entity helps avoid unnecessary aggressive management and ensures appropriate treatment.