Retroperitoneal seminoma, a rare cause of testicular pain

Extragonadal retroperitoneal seminomas are a rare cause of testicular pain in males. We report the case of a 46-year-old man, who presented with right-sided testicular pain, clinically mimicking testicular torsion. The patient underwent a scrotal exploration, which revealed normal testes. He went on to have a contrast-enhanced CT abdomen and pelvis, which revealed a 55 mm para-aortic mass, displacing the duodenum and inferior vena cava, with an adjacent 22 mm lymph node. Histological analysis revealed that it was a seminoma.