Division isthmus

(A) Reproduced with permission from: Clark O. Fine needle aspiration biopsy of the thyroid: Thyroid lobectomy and subtotal and total thyroidectomy. In: Mastery of Surgery, Fischer JE, Bland KI, Callery MP (Eds), Lippincott Williams & Wilkins, Philadelphia 2006. Copyright © 2006 Lippincott Williams & Wilkins.
(B) Reproduced with permission from: Fox AC, Gauger PG. Thyroid lobectomy. In: Operative Techniques in Surgery, Mulholland MW, Albo D, Dalman RL (Eds), Wolters Kluwer Health, Philadelphia 2015. Copyright © 2015 Wolters Kluwer Health.