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The most basic methods of examining a lump in the neck are palpation by a doctor and cervical ultrasound. Unlike CT, cervical ultrasound does not use radiation and can be performed at the same time as a diagnosis, which has the advantage of shortening the examination time. However, the accuracy of ultrasound examinations can vary depending on the skill of the examining doctor, so it is helpful to be examined by an experienced doctor. Let's listen to the explanation by Director Jo Woo-jin.