[Primary synovial sarcoma in the groin]. / Primaert synovialt sarkom i ingvinalregionen.

This is a case report of a rare case of primary synovial sarcoma in the groin. A 19-year old male was admitted with a mass in his left inguinal region suspecting an inguinal hernia. He had been aware of the swelling for 10 years but only experienced pain during the previous few months when the mass had grown. Excision took place, but microscopy showed synovial sarcoma. PET/MR scan showed no signs of dissemination. Wide surgical excision was undertaken, followed by adjuvant radiation treatment. The case illustrates possible differential diagnoses before the treatment of an apparent inguinal hernia.