PMC5890719_01
In normal patients the GON is identified between the Obliquus capitis inferior muscle (OCI) and semispinalis capitis muscle (SSC) (* OCI; ** SSC) as a hypoechoic round small structure (arrow);
b
In our patient there is a structure that prevents locating of the GON (arrow);
c
The Doppler signal indicates a venous vessel;
d
and
e
CT scan of our patient that confirms venous plexus enlargement in the cervical region (arrows).
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FI0127-0001
 In our patient, in the fascial plane between the OCI and SSC, an abnormal tortuous vessel was identified bilaterally, preventing identification of the nerve trunk ( Fig. 1b ). The Doppler signal revealed low flow velocities and resistance, consistent with a venous vessel ( Fig. 1c ). The study also showed evidence of degenerative changes in the cervical spine with no other structural abnormalities ( Fig. 1d and e ). 