FAST Double Line Sign, a common False Positive

Article describing this finding: http://bit.ly/A7fAB
On the FAST (Focused Assessment by Sonography in Trauma) exam there can be a common false positive finding called the Double Line Sign. The Double Line is the renal capsule and the Peritoneum with perinephric adipose tissue inbetween. Basically you are visualizing DeGrotta's Fascia.

The perinephric fat is recognized by its internal echos and location between the 2 hyperechoic tissue layers. This is analogous to seeing a pericardial fat pad around the heart on the FAST or echocardiographic exam.

This is not free fluid but can commonly be mistaken for such especially if the person is rushing, does not follow protocol, or has improper gain settings.

Category:

Education

Tags:

• Emergency Medicine
• Ultrasound
• Emergency Ultrasound
• FAST
• Trauma
• Double Line
• Education

[annahaskari]

quite obvious..