To describe a case of Leydig cell tumor of the testis, discuss the criteria for determining its benign or malignant nature and the clinical features according to patient age and the hormone profile.Scrotal US evaluation for an associated pathology incidentally detected a hypoechoic, homogeneous mass with preserved borders. Biological testicular tumor markers were determined and the suspicion of a Leydig cell tumor prompted a hormone study. The diagnosis of Leydig cell tumor was confirmed by intraoperative biopsy and radical orchidectomy was performed.In the case described, the ultrasound findings prompted the etiological diagnosis given the characteristics of the lesion. The definitive diagnosis was based on the pathological findings. Although classified as benign Leydig cell tumor, radical orchidectomy is advocated.