Explanation
The area indicated by A is the region of the left clavicular head. The area indicated by B is the left first rib. The area indicated by C is the left second rib. The area indicated by D is the left T2 transverse process.
For comparison, a common abnormality of the upper ribs is show below.
Image A is a radiograph of the cervical spine showing additional tiny ribs originating from the 7th cervical vertebra, called cervical ribs. These ribs are often asymptomatic, but can press on vessels or nerves. The extra ribs are shown in red. The normal first ribs are shown in blue and the 7th cervical and first thoracic vertebra in yellow.
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