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Presence (A) and absence (B) of a normal rim between the tumor and course of the RLN. The path of the RLN is more oblique on the right side than on the left side. Thus, tumors located away from the tracheoesophageal groove but in the dorsal region might still be at risk of invading the RLN. L, left side; R, right side; RLN, recurrent laryngeal nerve.
