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Related Experiment Videos

Transition from cold to hot thyroid nodules

S Tumino1, C Fornito, A Laudani

  • 1Istituto di Medicina Interna e Specialità Internistiche, Cattedra di Endocrinologia, Ospedale Garibaldi, University of Catania, Italy.

Thyroid : Official Journal of the American Thyroid Association
|February 12, 1998
PubMed
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Autonomously functioning thyroid nodules (AFTNs) can initially appear hypofunctioning on radioactive iodine scans. Later re-evaluation revealed these "cold" nodules were indeed AFTNs, challenging initial diagnoses.

Area of Science:

  • Endocrinology
  • Nuclear Medicine

Background:

  • Autonomously functioning thyroid nodules (AFTNs) are a common cause of hyperthyroidism.
  • Diagnosis typically involves radioactive iodine (131I) scintigraphy to assess thyroid nodule function.

Observation:

  • Three cases of AFTNs initially presented as hypofunctioning ('cold') nodules on 131I scans.
  • Patients had normal thyroid hormones and TSH levels at initial observation.
  • Initial misclassification led to levothyroxine (LT4) treatment.

Findings:

  • Delayed diagnosis of AFTN occurred years later upon repeat thyroid scintigraphy.
  • Two patients developed levothyroxine intolerance, prompting re-evaluation.
  • Hemorrhagic or cystic degeneration may explain initial hypofunctioning appearance, with subsequent proliferation leading to functional recurrence.

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Implications:

  • This highlights the potential for misinterpreting initial scintigraphy findings in AFTNs.
  • Careful long-term follow-up is crucial for nodules with atypical presentations.
  • Understanding nodular degeneration and regeneration is important for accurate thyroid nodule management.