CEUS Time Intensity Curves in the Differentiation Between Leydig Cell Carcinoma and Seminoma: A Multicenter Study

Area of Science:

• Radiology
• Oncology
• Urology

Background:

• Ultrasound (US) is the primary imaging modality for testicular masses.
• Leydig cell tumors are typically benign (90% of cases), making accurate differentiation crucial.

Purpose of the Study:

• To evaluate the effectiveness of contrast-enhanced ultrasound (CEUS) in distinguishing Leydig cell tumors from seminomas.
• To utilize both qualitative and quantitative features of CEUS for differentiation.

Main Methods:

• Prospective multicenter study involving 31 patients with testicular lesions.
• All patients underwent grayscale US, color Doppler US (CDUS), CEUS, and ultimately orchiectomy.
• Paired one-tailed Student's t-test was used for statistical analysis.

Main Results:

• Hypoechoic lesions on grayscale US and atypical patterns on CDUS were observed.
• Qualitative CEUS analysis did not reliably differentiate between Leydig cell tumors and seminomas.
• Quantitative analysis of time-intensity curves (TICs) showed significant differences in wash-in rate (WiR), peak enhancement (PE), and time to peak (TTP).

Conclusions:

• Leydig cell tumors exhibit wider vascular beds and higher blood flow velocity than seminomas due to more regular neovascularization.
• Seminomas present with larger necrotic areas resulting from irregular neovascularization, explaining observed differences in PE and WiR.
• Further large-scale studies are needed to validate these preliminary findings.