PMC9918333_01
Body surface photographs of the neck. . A mass is visible in the left supraclavicular fossa (white arrow).
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FIG1
On a repeated physical evaluation, a soft mass was revealed in the left supraclavicular fossa (Figure 1).
Plain computer tomography and magnetic resonance image.. Plain computer tomography (A) and magnetic resonance image (B) of the neck show the anomalous muscle on the left brachial plexus (white arrow). It is not present on the right side.
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FIG2
MRI of the left brachial plexus showed the same pattern (Figure 2).
Magnetic resonance images of the neck. T1-weighted magnetic resonance images of the neck (A, B, C, D, E, F, G, H) show the anomalous muscle. It originates from the nuchal ligament and stops in the middle one-third of the clavicular head side (white arrow).
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FIG3
It originated from the nuchal ligament and stopped in the middle one-third of the upper clavicular side (Figure 3).
Radiographs after ultrasound-guided neurography of the brachial plexus.. The contrast has moved caudally from the injection site, but the head side and head down positions show a blocked image (A). Upon left upper extremity elevation, which reduced symptoms, contrast migration to the head side is observed (B).
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FIG4
When left upper extremity elevation was performed, symptoms were reduced and contrast migration to the head side was observed (Figure 4).