The 3D model depicts a primary tumour classified as T3b, showing a neoplasm that demonstrates gross extrathyroidal extension with involvement of the strap muscles (sternohyoid, sternothyroid, or omohyoid muscles). It illustrates the tumour breaching the thyroid capsule and infiltrating the adjacent muscular structures of the anterior neck, emphasizing the aggressive local behavior and the clinical significance of this invasion. The condition requires more extensive surgical resection, including en bloc removal of involved muscles, and is associated with an increased risk of local recurrence and reduced overall survival compared to T1 and T2 tumours.
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