Reply To: Swelling ECRB and ECRL muscle

[Xue Heng]

Hi, Steve! Thank you again for your meticulous answer.
Yes, it seems anisotropy is the most probable reason for this phenomenon.
I did not consider the possibility of radial tunnel syndrome, but I just inadvertently scanned the PIN entering the supinator at the arcade of Frohse.
I’m sorry I did not compare the echo of the muscle to the other side.
And I guess the affected muscle did not feel firm clinically compared to the other side.
Thank you, Steve. I admit anisotropy is everywhere in MSK ultrasound.
I know it is most obvious in tendon and ligament, but I’m unaware of the fact that it could affect the echo of muscle as well.