Special US pattern of thyroid lesions; “nodule within the nodule”

Purpose: The technical improvement of modern ultrasound (US) equipment allows a better evaluation of the sonographic structure of the thyroid and of the thyroid nodules (TN). The aim of this prospective study is an evaluation and presentation of a new US-pattern of the thyroid lesions denominated “nodule within the nodule”. Methods: Thyroid US with 18 MHz transducer in 540 patients. In case of solid TN, the presence of additional circumscribed thyroid lesions within the nodule was studied. The uptake of such TN at thyroid scan with 99 m-Tc-Pertechnetate and/or the histology after surgery was evaluated. Results:…