Background: Morphological and developmental anomalies of thyroid gland have been reported in literature such as hypoplasia, ectopic thyroid, hemiagenesis or agenesis of gland. Agenesis of thyroid isthmus is a rare congenital anomaly and few cases were reported earlier.
Case presentation: A female cadaver in dissection hall was found with agenesis of isthmus of thyroid gland. From the right lobe, the pyramidal lobe arises with levator glandulae thyroideae.
Discussion: Agenesis of isthmus does not cause clinical symptoms by itself and diagnosis is secondary due to the existence of other thyroid pathology. This may be due to mutation of genes associated with thyroid gland.
Key words: Thyroid agenesis, agenesis of isthmus, pyramidal lobe, thyroglossal duct anomalies
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