Purpose To investigate the ultrasound imaging characteristics of Xp11.2 translocation/TFE3 gene fusion renal cell carcinoma(Xp11.2/TFE3-tRCC).Materials and Methods A retrospective analysis was conducted of 10 patients with pathologically confirmed Xp11.2/TFE3-tRCC who underwent surgery in West China Hospital of Sichuan University from April 2009 to February 2022.The ultrasonic images were collected and further analyzed,including tumor border,shape,internal echoes,Doppler findings,and contrast-enhanced ultrasonography findings.Results A total of 10 masses were finally included,4 of which underwent contrast-enhanced ultrasound.The ultrasonographic manifestations of Xp11.2/TFE3-tRCC showed diversity and variability,and the mass was most commonly located in the medulla(5 cases).Conventional ultrasound showed solid nodules with clear boundaries and regular shape similar to benign lesions in 6 cases,and color Doppler showed punctated blood flow signals in 5 cases.Contrast-enhanced ultrasound was more inclined to malignant tumors(3 cases),which showed uneven enhancement,mostly accompanied by peripheral uneven enhancement rings.Conclusion Xp11.2/TFE3-tRCC tends to be benign on conventional ultrasound,while contrast-enhanced ultrasound shows malignant lesions.Therefore,contrast enhanced ultrasound can serve as a potential diagnostic tool for suspected Xp11.2/TFE3-tRCC.
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