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Group A. Suspicious for papillary thyroid carcinoma (PTC) seen on ultrasonography. A 55-year-old male had a 0.7-cm-sized irregular hypoechoic nodule (arrow) with microcalcification in the paraisthmic portion of the left thyroid gland, which was inconclusive at repeated ultrasonography-guided fine-needle aspiration cytology. Ultrasonography-guided core needle biopsy finally revealed PTC and the patient underwent surgery.
