Abstract
Thyroid hemiagenesis is a rare congenital anomaly that is caused by a developmental defect of a thyroid. Previous reports indicate that thyroid cancer associated with hemiagenesis is extremely rare. A 47-year-old woman presented with single nodule in the right thyroid gland that was incidentally detected during a routine medical checkup. Ultrasonography showed a 1.5×1.2 cm sized ill-defined irregular hypoehoic nodule in the right thyroid and the isthmus was present. However, the left thyroid was not seen and thyroid was disconnected at left paraisthmic area. Fine-needle aspiration cytology confirmed that the right thyroid nodule was papillary thyroid carcinoma. Total thyroidectomy with bilateral central compartment node dissection was performed. Permanent pathologic finding was 1.3×1 cm sized classical type papillary thyroid carcinoma with nodular hyperplasia. There was extensive lymphatic invasion and 3 metastatic lymph nodes out of 4 in central compartment. In conclusion, although thyroid hemiagenesis associated with thyroid carcinoma is extremely rare, treatment strategy is not different with patients with normal anatomy. And the possibility of developing a thyroid carcinoma should be considered in patients with hemiagenesis. Furthermore, it requires awareness of anatomical difference around the thyroid gland during operation.
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Fig. 1.
Ultrasonography of the thyroid gland showing one hypoechoic nodule (arrow) in the right thyroid (A) and no thyroid tissue in the left thyroid (B).

Table 1.
Thyroid hemiagenesis associated with thyroid cancer