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  • Title: Ultrasound guided biopsy of nonpalpable and difficult to palpate thyroid masses.
    Author: Sanchez RB, vanSonnenberg E, D'Agostino HB, Shank T, Oglevie S, O'Laoide R, Fundell L, Robbins T.
    Journal: J Am Coll Surg; 1994 Jan; 178(1):33-7. PubMed ID: 8156114.
    Abstract:
    We reviewed our experience with ultrasound-guided biopsies of masses of the thyroid gland that were either nonpalpable or difficult to localize by palpation to evaluate the technique and correlate the results. Thirty-two biopsies were performed upon 25 patients whose clinical presentations were palpable nodule (six patients), throat discomfort (two patients), postpartial thyroidectomy follow-up evaluation (two patients), incidental discovery of a mass--by ultrasound of the neck (two patients), roentgenogram of the chest (two patients), computed tomography of the chest (one patient) and during tracheostomy placement (one patient). Other presentations were eliminate infection (one patient), odynophagia (one patient), hoarseness (one patient), cold nodule on a nuclear medicine study (one patient), hyperparathyroidism (one patient), rule out metastasis from carcinoma of the colon (one patient), persistent cough (one patient), enlarged thyroid gland (one patient) or family history of carcinoma of the thyroid gland (one patient). Fifteen patients had nuclear medicine studies showing either a cold nodule (ten patients), multinodular goiter (one patient), normal examination (two patients), hot nodule (one patient) or no thyroid gland activity (one patient). The ultrasound examinations showed either a hypoechoic nodule (25 patients), inhomogeneous or mixed echogenic nodule (six patients) or a hyperechoic nodule with hypoechoic rim (one patient). The nodules ranged in size from 3 milliliters to 7 centimeters. Twenty-six lesions were less than 3 centimeters in diameter; of the other six, four were substernal goiters. Six patients had a previous nondiagnostic biopsy directed by palpation only. Biopsy was performed using real-time ultrasound guidance with various needles. One patient had a small hematoma, which was the only complication in the study. The results of the biopsies were diagnostic in 26 of 32 patients. The final diagnosis was benign follicular cells (ten patients), adenomatous nodule (seven patients), follicular neoplasm (three patients), colloid cyst (two patients), aspergillus (two patients), fibrosis (one patient) and papillary carcinoma (one patient). Six of the biopsies yielded unsatisfactory specimens. One of the patients with a diagnosis of benign follicular cells on biopsy had a follicular carcinoma after surgical pathologic factors were obtained; that was the only false-negative result. We conclude that ultrasound-guided biopsy of the thyroid is a safe and useful method of evaluating nonpalpable and difficult to palpate thyroid masses.
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