Modern ultrasound is highly valuable, useful, and reliable in differential diagnosis of tumors in the preauricular area, submandibular area, and cheek. It enables precise localization, measurements, and assessment of the structure of lesions. It may be the first and last imaging method needed to formulate the final diagnosis, or it may guide fine-needle aspiration biopsy. In many cases, ultrasound may also suggest the nature of the tumor.
For treatment planning of liver metastases, the use of either plain T1w or T2w sequences is recommended to delineate the clinical target volume as completely as possible and not to miss potential tumor cell congregations in the surroundings as in CT.
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