Unilateral thyroid agenesis (thyroid hemiagenesis) is a sicknesswhere one lobe of the thyroid gland fails to increase normally and thisis thought to be the rarest of all of the developmental thyroidanomalies [1].Нe first reviews of this entity seemed in 1866 by +Dndfield--ones,in 1876 through Luschka and in 1886 via Ehlers [2]. Structural, congenitalthyroid anomalies can be resulting from either ordinary genesis orordinary descent of part of the thyroid gland [2]. НyroLdhemiagenesis is a unprecedented circumstance with handiest about 270 cases stated inthe arena literature up to 2003 [2] and still simplest about 300 cases , mostas case research by using the 12 months 2010 [3].НroLd hormones (THs) regulate many features of fetal development  Also, the balance among antioxidants/prooxidants is essential for the cell homeostasis and for theimprovement [30,5-10]. НLs safety is probably facilitated by using thematernofetal thyroid states [2,5,6,31,32]. Additionally, the defensemechanisms towards loose radical-prompted oxidative pressure involve [2,33](1) preventative mechanisms; (2) repair mechanisms; (3) physicaldefences; and (four) antioxidant defenses. Alternatively, it changed into additionally saidthat reactive oxygen species (ROS) may additionally play crucial roles in numerousdevelopmental and physiological tactics, but when being inexcess ROS can reason oxidative harm