Agenesis of isthmus of thyroid gland, its embryological basis and clinical significance--a case report.

A wide range of morphological varieties and developmental anomalies of the thyroid gland have been reported in literature such as hypoplasia, ectopy, hemi agenesis, and agenesis. Out of these the incidence of agenesis of the isthmus of thyroid gland is rare and very few cases have been reported. In the present case report a male cadaver was found with agenesis of isthmus of thyroid gland with pyramidal lobe and levator glandulae thyroidae arising from right lobe.