Temporal Changes in Thyroid Nodule Volume: Lack of Effect on Paranodular Thyroid Tissue Volume

Giorgio Grani, Rocco Bruno, Giuseppe Lucisano, Giuseppe Costante, Domenico Meringolo, Efisio Puxeddu, Massimo Torlontano, Salvatore Tumino, Marco Attard, Livia Lamartina, Antonio Nicolucci, David S Cooper, Sebastiano Filetti, Cosimo Durante

Research output: Contribution to journalArticle

Abstract

Background: The term "nodular goiter" has long been used to refer to a nodular thyroid gland, based on the assumption that nodule growth may be associated with hyperplasia of the surrounding non-nodular tissue. The aim of this prospective, multicenter, observational study was to determine whether nodule growth is accompanied by growth in the non-nodular tissue. Methods: Eight Italian thyroid-disease referral centers enrolled 992 consecutive patients with one to four benign nodules. Nodular and non-nodular thyroid tissue volumes were assessed for five years with annual ultrasound examinations. Results: In participants whose nodules remained stable (n = 839), thyroid volumes did not change (baseline 15.0 mL [confidence interval (CI) 14.5-15.6]; five-year evaluation 15.1 mL [CI 14.5-15.7]). In participants with significant growth of one or more nodule (n = 153), thyroid volumes increased and by year 5 were significantly greater than those of the former group (17.4 mL [CI 16-18.7]). In 76 individuals with unilateral nodules that grew, the mean nodular lobe volume significantly exceeded that of the contralateral lobe (8.6 mL [CI 7.4-9.8] vs. 6.7 mL [CI 6-7.4]). The unaffected lobe volumes remained stable over time, while nodular lobes grew steadily and were significantly greater at the end of follow-up (10.1 mL [CI 8.9-11.3]). Excluding the volume of the largest growing nodule in these cases, the remaining volume of the affected lobe remained virtually unchanged with respect to its baseline value. Furthermore, there was no significant difference in the non-nodular tissue volume between the unaffected lobe and the affected lobe (with the largest growing nodule volume subtracted), both at baseline and at the end of follow-up. Conclusions: The growth of thyroid nodules is a local process, not associated with growth of the surrounding non-nodular tissue. Therefore, a normal-sized thyroid containing nodules should be referred to as a "uni- or multinodular thyroid gland" and considered a distinct entity from "uni- or multinodular goiter."

Original languageEnglish (US)
Pages (from-to)1378-1384
Number of pages7
JournalThyroid
Volume27
Issue number11
DOIs
StatePublished - Nov 1 2017

Keywords

  • goiter
  • neck ultrasound
  • nodular goiter
  • thyroid gland
  • volume

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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    Grani, G., Bruno, R., Lucisano, G., Costante, G., Meringolo, D., Puxeddu, E., Torlontano, M., Tumino, S., Attard, M., Lamartina, L., Nicolucci, A., Cooper, D. S., Filetti, S., & Durante, C. (2017). Temporal Changes in Thyroid Nodule Volume: Lack of Effect on Paranodular Thyroid Tissue Volume. Thyroid, 27(11), 1378-1384. https://doi.org/10.1089/thy.2017.0201