The scrotal masses are a frequent motive of consultation. The etiologic diagnosis of scrotal abnormalities is not always resolved by an accurate physical examination. From january 1985 to december 1987, 30 ultrasound examinations were performed. In the same period 245 patients were admitted for a scrotal mass. In a retrospective study the clinical diagnosis and ultrasound examination were compared with surgical and/or pathological findings, concerning 7 scrotal trauma, 8 hydrocele, 6 tumors, 4 epididymo-orchitis, 3 torsion, 1 epididymal cyst and 1 malacoplakia. The ultrasound findings correlated well in 85% of cases. Ultrasound examination appears to be an important complement to physical examination in trauma, large tumors and inflammatory lesions.