Serous Borderline Tumor of the Testis and Associated Magnetic Resonance Imaging Findings

Abstract Serous borderline tumor (SBT) of the testis is a rare, ovarian epithelial-type tumor of the testis. We present a case of SBT after radical orchiectomy in a 59-year-old man who had 3-month progressive enlargement of his right hemi-scrotum, negative testicular tumor markers and scrotal ultrasound equivocal for malignancy. Magnetic resonance imaging (MRI) of the pelvis was obtained to aid with evaluation and showed marked hyperintensity on T2-weighted images with frond-like nodular peripheral enhancement within right testis mass. These distinct MRI findings can help clinicians differentiate SBT from other testis tumors. Relapse has not been observed in 8 years of follow-up.