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Related Concept Videos

The Thyroid Gland01:23

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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
The follicles have a central cavity lined by simple cuboidal to squamous epithelial cells called follicular cells. These cells produce the glycoprotein...
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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Multiple thyroid cysts: a benign and stable clinical entity based on longitudinal data.

Yuji Nagayama1, Seigo Tachibana1, Takashi Fukuda1

  • 1Department of Endocrinology, Yamashita Thyroid Hospital, Fukuoka 812-0034, Japan.

Endocrine Journal
|April 8, 2026
PubMed
Summary
This summary is machine-generated.

Multiple thyroid cysts are common and usually benign, often not requiring intervention. This study found most cases remain stable, supporting conservative management with regular monitoring.

Keywords:
HypothyroidismIodineMultiple thyroid cystsPolycystic thyroid diseaseUltrasonography

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Area of Science:

  • Endocrinology
  • Thyroidology
  • Diagnostic Imaging

Background:

  • Multiple thyroid cysts are frequently detected via ultrasonography but often deemed clinically insignificant.
  • Polycystic thyroid disease (PCTD) is a proposed cause of antibody-negative hypothyroidism, yet the broader clinical picture of multiple thyroid cysts is unclear.

Purpose of the Study:

  • To clarify the clinical characteristics and natural history of multiple thyroid cysts.
  • To investigate the prevalence and potential link of multiple thyroid cysts to polycystic thyroid disease (PCTD).

Main Methods:

  • Retrospective review of 7,727 new thyroid outpatients (2013-2016).
  • Defined multiple thyroid cysts as ≥4 cysts (≥3 mm diameter) without thyroid autoantibodies.
  • Followed 46 patients for ≥5 years (mean 9.8 years) without iodine restriction.

Main Results:

  • 164 patients (2.1%) met the criteria; 91% were female, mean age 58.3 years.
  • Most patients (86.6%) were euthyroid at presentation; ~6% had subclinical thyroid dysfunction.
  • Thyroid function remained stable in most followed patients, with no progression to overt dysfunction or need for intervention; cyst size varied.
  • Cyst distribution patterns did not correlate with thyroid function.

Conclusions:

  • Multiple thyroid cysts are generally benign and stable clinical entities.
  • Conservative management with periodic monitoring is supported for most patients with multiple thyroid cysts.
  • A subset of multiple thyroid cysts may represent PCTD, warranting further investigation.