A male patient had undergone total thyroidectomy for thyroid papillary carcinoma. He was administered thyroablation activity of radioiodine. Whole body imaging after diagnostic activity of 131-I demonstrated intense radioiodine uptake in the right side of the upper abdominal region. The serum thyroglobulin level was low. Ultrasonography demonstrated a large irregular anechoic structure in the centre of the right kidney — a cyst in the parapelvic region. Renal cysts can lead to erroneous interpretation of radioiodine scintigraphy. Nuclear Med Rev 2011; 14, 1: 36–37
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