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Large simple fluid density cystic lesion in the left neck posterior to the sternocleidomastoid muscle and lateral to the carotid vessels, extending inferiorly below the clavicle in to the superior mediastinum and apex of the left axilla. The lesion is displacing the smoothly abutted left-sided great neck vessels, left thyroid lobe and trachea to the contra-lateral side. Few thin septations are seen in it. No calcifications or solid component is seen in it. No abnormal enhancement is seen in it.