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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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Thyroid micro-carcinoma: only a diagnostic epidemic?

Paolo Del Rio1, Chiara Montana Montana2, Giulia Mingardi1

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Fine needle aspiration cytology (FNAC) is crucial for diagnosing thyroid cancer, offering high sensitivity and specificity. Integrating molecular techniques with FNAC can improve surgical indications for better therapeutic outcomes.

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Area of Science:

  • Endocrinology
  • Oncology
  • Cytopathology

Background:

  • Thyroid carcinoma incidence varies globally, with differentiated thyroid tumors showing a rising trend.
  • While rare, pediatric thyroid nodules can be malignant, necessitating accurate diagnostic methods.
  • Color Doppler ultrasonography is a key imaging technique for thyroid cancer, complemented by fine needle aspiration cytology (FNAC) for diagnosis.

Purpose of the Study:

  • To evaluate the diagnostic performance of fine needle aspiration cytology (FNAC) in thyroid cancer.
  • To assess the sensitivity, specificity, and accuracy of FNAC in classifying thyroid nodules.

Main Methods:

  • A prospective study analyzed 1726 thyroidectomy cases from 2004-2013.
  • Cytology samples were obtained via standard FNAC or capillary aspiration.
  • Results were classified using the Italian SIAPEC-AIT system (2008), with statistical parameters including sensitivity, specificity, and predictive values.

Main Results:

  • FNAC demonstrated a sensitivity of 60-98% and specificity of 72-100%, consistent with existing literature.
  • Diagnostic accuracy decreased when considering the Tir3 category (low malignancy risk) as non-surgical.

Conclusions:

  • Micro-carcinoma is more prevalent than previously thought.
  • Cytology is the primary diagnostic tool for thyroid nodules but is subject to false negatives.
  • Combining cytological data with molecular biology techniques can refine surgical indications, shifting focus from diagnostic to therapeutic interventions.