Small testicular solid lesions are discovered accidentally due to the extensive use of ultrasound in urology and andrology. Early differentiation between benign and malignant testicular neoplasms is crucial for the determination of treatment options, especially for sub-centimetre lesions. We report a case of a male patient with an incidental discovery of a small testicular lesion on ultrasonography with the chief complaint of left testicular discomfort. The blood-flow distribution and microbubble dynamics in the lesion were evaluated through contrast-enhanced ultrasound using Sonazoid intravenous bolus injection, the rapid and intense enhancement pattern tended to be testicular Leydig cell tumour. Through testicular-sparing surgery, the lesion was excised, and benign testicular Leydig cell tumour was confirmed by post-operative pathology and immunohistochemical pathology. No sign of recurrence or metastasis was detected during follow-up.
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