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browse thyroid hyperthyroidism hypothyroidism pemberton sign goiter woody goiter differential diagnosis of goiter thyroid examination thyroid history lid lag lid retraction exophthalmos ophthalmoplegia thyroid abdominal examination macleod branchial cyst carotid body tumor branchial cleft sternocleidomastoid tumor pharyngeal pouch cervical rib cold abscess cervical ln expansile pulsation transmitted pulsation fluctuation