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Updated: May 31, 2026

Point-of-Care Kidney and Genitourinary Ultrasound in Adults: Image Acquisition
Published on: June 21, 2024
I-131 false positive uptake in a huge parapelvic renal cyst
Otakar Kraft1, Pavel Sirucek, Lubomír Mrhac
1Clinic of Nuclear Medicine, University Hospital Ostrava, Czech Republic, Clinic of Nuclear Medicine, 17. listopadu 1790, Ostrava–Poruba, Czech Republic. otakar.kraft@fno.cz
Abstract:
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.
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