THE LATERAL THYROID LIGAMENT OF BERRY

Division of the lateral thyroid ligament is essential for total thyroi d lobectomy, The exact extent of this ligament, first described by Ber ry in 1888, was studied in a series of 25 cadaveric and post-mortem su bjects. The ligament was attached to the inferior margin of the cornu of the cricoid cartilage, near its pole, and extended infero-medially onto the tracheal wall, reaching the midline in 4 of the 50 lobes exam ined. At the level of the cricoid cartilage, the mean distance between the attachment of the ligament to the cricoid cartilage and the recur rent laryngeal nerve (RLN) entry point into the larynx was 1.9 mm, Thi s region corresponds to the area where RLNs are mostly injured during thyroid surgery. Awareness of the extent of this ligament and the prox imity of the RLN to it should lessen the risk of injury to the RLN dur ing thyroid lobectomy and total thyroidectomy.