3D MRI, Transverse Sequence

This is a selected image from the transverse sequence. In the transverse sequence, images are perpendicular to the line of sight when viewing the supine patient from the soles of the feet toward the head. The transverse sequence displays this patient's narrow fascial planes, costoclavicular compression of the axillary veins lateral to the subclavian veins (SV) on the first ribs, acute backward displaced subclavian arteries with binding nerve roots, the first division of the right subclavian artery effacing the bicuspid valve within the internal jugular vein as it acutely angles posterior to the right anterior scalene muscle, and the anterior rotated clavicle compressing the bicuspid valve within the left internal jugular vein. This image clearly displays the close proximity of the clavicles (C, only right one labeled) with subclavius muscles (SUB, only left one labeled) to the axillary veins (lateral to the subclavian veins, SV), compressing the external jugular veins (XJ) against the bulbous expanded subclavian veins (SV), on the first ribs, against the anterior scalene muscles. Note: The bulbous expansion of the subclavian veins is clearly visible in the image (large dark tubule structures identified by the labels SV). To fully understand this image, it is necessary to cross-reference with the coronal and sagittal images.

A few labels have been placed on the image to assist with identification of landmark anatomy. The clavicle (C), subclavius muscle (SUB), subclavian veins (SV), brachiocephalic artery (BR), brachiocephalic vein (BRV), trachea (T), right lung (RL), and left lung (LL) are labeled for reference. The first division of the right subclavian artery is not visible in this image, but it lies between the brachiocephalic vein (BRV) and the trachea (T) in an adjacent image in this sequence.