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Ultrasound images of testis appearance in Klinefelter syndrome using high‐frequency (12 MHz) linear probe. (A) Some foci of Leydig cell hyperplasia as hypoechoic round lesion with regular but blurred margins; (B) the different ultrasound histological damage aspects of the gonads during the succession of pubertal stages. The parenchymal irregular hypoechogenicity and hypervascularization are particularly evaluable. The last image reports a focus of Leydig cell hyperplasia
