Fig. 1From: The clinical significance of remnant thyroid tissue in thyroidectomized differentiated thyroid cancer patients on 131I-SPECT/CTThe regions (I–VI) of RTT. In cases of a–f, the RTT lesions with high-uptake tracer activity were located respectively in region I (adjacent to the left side of tracheal cartilage), region II (adjacent to the left side of cricoid cartilage), region III (adjacent to the right posterior border of thyroid cartilage), region IV (adjacent to the left thyroid lamina), region V (adjacent to the midline of anterior thyroid cartilage) and region VI (outside the left infrahyoid muscle)Back to article page