IT IS difficult to estimate precisely the incidence of various developmental anomalies of the thyroid since in many individuals these remain unsuspected. The following case is reported because of its rarity.
Report of Case
In a man, aged 26 years, an elongated swelling was noticed in the neck during a routine physical examination. He had no local or systemic symptoms, though the swelling had been present for about eight months. Clinical examination showed an elongated banana-shaped swelling in the midline, in front of the trachea, extending from the hyoid bone to just above the sternal notch (Fig 1). It was uniformly soft in consistency, was mobile, and moved with deglutition. There was no bruit over the swelling. The regional lymph nodes were not palpable and there was no palpable tissue in the normally expected position of the lateral thyroid lobes. Clinically, he was euthyroid. There was no family history of