Fig. 2

Three standard steps method for working space make. A, B Step one, dissection of the route to the anterior neck area. The dissected area is marked in red. C, D Step two, sternocleidomastoid muscle (SCM) was dissected longitudinally and the sternal head of SCM was elevated by the retractor to expose the strap muscles. The dissected area is marked in green. E, F Step three, the strap muscles were dissected laterally and the retractor was placed beneath the straps muscle to expose the thyroid lobe. The dissected area is marked in blue