To check the possible relationship between testicular microlithiasis and testicular carcinoma in a patient in the one which previously we discovered a sonographic image of this condition. The etiopathogenesis, incidence and attitude are discussed.A 23-year-old male with a psychomotor retardation secondary to a chromosomopathy presented with orchitis. Scrotal ultrasound discovered testicular microlithiasis, described as many hyperechoic images. Thirteen months later a testicular cancer was found in a new ultrasound. Radical orchiectomy was performed. Currently the patient is under intense follow-up.The histopathological study showed mature teratoma and intratubular germ cell neoplasm.The testicular microlithiasis has been related with benign and malignant testicular pathology. However, this presence it is not sufficiently clarified and the urologist's attitude to a patient with testicular microlithiasis but asymptomatic is not enough studied.