Thyroid Isthmus Agenesis: A Rare Phenomenon

The thyroid gland is composed of two lobes connected by an isthmus that traverses the midline upper trachea between second and third tracheal rings. most common manifestation dysgenesis hemi agenesis or ectopic tissue. Specifically, incidence rate ranges 0.5 10%. Remember identification other anomalies during preoperative evaluation patients scheduled for surgery would significantly contribute to safer surgical procedures fewer complications. We present a patient with enlarged right nodule on USG who was hemithyroidectomy but ultimately diagnosed intraoperatively agenesis.