Dynamic color Doppler assessment for the detection of small abdominal hernias: the "Cocco Sign"

To describe an innovative, dynamic ultrasound technique for detecting abdominal hernias using the Color Doppler effect, particularly in small hernias and those that are challenging to identify with conventional ultrasound methods.

With the patient in a supine position, the ultrasound probe is positioned over the suspected hernia area without applying compression. The sonographer activates the Color Doppler box and instructs the patient to perform a Valsalva maneuver.

During the Valsalva maneuver, the hernia sac becomes visible as a red Doppler signal moving toward the probe, clearly indicating its presence and motion. When the Valsalva maneuver is stopped and intra-abdominal pressure decreases, the hernia retracts back into the abdominal cavity, resulting in a blue signal moving away from the probe. The combination of the Color Doppler effect and the Valsalva maneuver enhances the detection of small hernias, where a narrow defect increases tissue velocity and generates clearer Doppler signals. This characteristic Doppler pattern is here proposed as a novel diagnostic indicator, referred to as the "Cocco Sign."

This dynamic ultrasound assessment using the Color Doppler effect may significantly enhance the identification of hernias-especially small ones that are challenging to visualize with conventional ultrasound techniques. This innovative approach has the potential to significantly enhance the diagnosis of hernias.