Ultrasound Assessment for Hydrocele

Imaging Approach

The American College of Radiology recommends scrotal ultrasound as the first-line and most appropriate imaging modality for evaluation of hydrocele, with high sensitivity for detection of scrotal abnormalities 1, 3, 4
The examination should include both grayscale and color Doppler assessment of the entire scrotum, including the testicle itself, the space between the parietal and visceral layers of the tunica vaginalis, the epididymis, and the spermatic cord 1, 3

A high-frequency linear transducer (typically 7.5-15 MHz) should be used for optimal resolution of scrotal structures 3
The patient should be positioned supine with the scrotum supported, and scanned in both transverse and longitudinal planes through the entire scrotum 1, 3
Color Doppler assessment should be included to evaluate for normal testicular blood flow and increased blood flow in adjacent structures 3, 4

The American College of Radiology warns against failure to adequately visualize the entire testicle when obscured by large hydrocele, which may miss underlying testicular tumors, and recommends evaluating for potential causes of reactive hydrocele, such as epididymitis 2
Inadequate assessment of both testicles for comparison should be avoided 1, 3

Follow-up ultrasound may be necessary if the hydrocele persists despite treatment of underlying condition, according to the American College of Radiology 2