First reported case of paratesticular seminoma in a postpubertal cryptorchid testis.

Cryptorchidism is a very common anomaly, affecting 2-4% of male infants and is more common in premature infants. The long-term outcome despite orchidopexy still remains problematic and controversial with a risk of developing cancer 5-10 times greater than normal. Paratesticular tumors are mostly benign and very rare in children however malignant paratesticular tumors do arise, the most common being rhabdomyosarcoma. Primary paratesticular seminoma is extremely rare by itself and in most cases is associated with foci of seminoma within the testis. To the best of our knowledge, our case represents the fourth reported case of paratesticular seminoma in the published literature and being the first one in cryptorchid testis.