Ultrasound image of the left thyroid area during US-FNABAn ultrasound examination during US-FNAB revealed a hypoechoic cystic lesion (red arrow) in the left thyroid. The margins were smooth and well-defined. A few echogenic granules were observed in the capsule. An FNAB was then performed with two needle passes of a 21-gauge needle. A hypoechoic solid lesion (white star) corresponding to the site of the left parathyroid was also identified but not biopsied.US-FNAB - ultrasound-guided fine-needle aspiration biopsy