PMC6315157_01
Ultrasound and cytological features of the thyroid nodule in our patient. (A) Ultrasound image showing an isoechoic solid nodule with a hypoechoic cranial component with blurred margins located in the isthmus of the thyroid. (B) Medium power magnification showing a hypercellular smear featuring thyrocytes arranged in microfollicular structures (DiffQuik staining, 100X).
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F1
An US evaluation confirmed an isolated lesion located in the isthmus, showing an isoechoic solid nodule with smooth margins; its size was 18 x 13 x 6 mm with intra and perilesional vascularity (Figure 1A). The cytological specimen showed an increased cellularity with some microfollicular structures in the background of scant colloid (Figure 1B). Thus, we assessed the risk factors associated with the isolated TIR 3A nodule of our patient.