There is evidence of an encapsulated, predominantly hypoechoic collection with internal echoes measuring 3.3 x 2.3 x 3.0 cm in the middle of the left calf in close proximity to the left posterior tibial artery. Doppler ultrasound shows the yin-yang sign due to turbulent flow within the collection.
The findings are suggestive of pseudoaneurysm of the left posterior tibial artery following an open fracture of left tibia.