Sarcomas

Soft tissue sarcomas and other tumors usually present within the lateral neck or paraspinal compartments. These are imaged equally well with MRI64 or contrast enhanced CT. CT tends to overestimate the overall size of neck masses65 compared with MRI— probably because of its multiplanar capacity. Vascular integrity and margins can also be surveyed at the initial MRI visit with the help of magnetic resonance angiography (MRA). Many patients can be spared catheter angiography. Sarcomas developing within sub-sites of the aerodigestive tract are imaged according to those protocols. Combining informa

Figure 3-25. Throid cancer MRI. Clockwise from upper left: Coronal and sagittal T1-weighted non-contrast images and axial T2-weighted images through base of neck and thoracic inlet. Note the lack of imaging artifacts. (1) Left lobe thyroid mass. (2) Extracapsular extension. (3) Tracheoesophageal lymph node metastasis. (4) Trachea. (5) Invasion of prevertebral muscles. (6) Plane of brachiocephalic vein. (7) Left common carotid artery.

Figure 3-25. Throid cancer MRI. Clockwise from upper left: Coronal and sagittal T1-weighted non-contrast images and axial T2-weighted images through base of neck and thoracic inlet. Note the lack of imaging artifacts. (1) Left lobe thyroid mass. (2) Extracapsular extension. (3) Tracheoesophageal lymph node metastasis. (4) Trachea. (5) Invasion of prevertebral muscles. (6) Plane of brachiocephalic vein. (7) Left common carotid artery.

tion from pretreatment MRI with CT based treatment planning lends confidence to those plans.

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